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Motorized Ears Give Mammals Acoustic Acuity 07/31/2007
Motors in your ears that amplify sound. What more could be said? He who has ears to hear, let him hear.Trilobite Tree Is Upside Down 07/28/2007 ![]() Darwin predicted that life would become more diverse over time, like the branches on a tree. The pattern of trilobites in the fossil record is just the opposite: more diversity appears in the lower layers, and less diversity in the upper layers. Surprisingly, evolutionary paleontologists are turning this into evidence for Darwins theory. Science Daily titled their article, Fossils Older Than Dinosaurs Reveal Pattern Of Early Animal Evolution On Earth. Acknowledging that trilobites appeared in an unprecedented explosion of life on Earth in the Cambrian strata, the article doesnt hint that this causes any problem for evolution. It quotes Mark Webster (U of Chicago) explaining the evidence in support of evolution: From an evolutionary perspective, the more variable a species is, the more raw material natural selection has to operate on. The idea is that trilobites started out in a more plastic state more variable and became channelized into specific body patterns later. Maybe this was because ecological niches forced the later trilobites into particular habitats that inhibited variation. Or maybe developmental processes within the early trilobites caused fewer constraints on the appearance of the organism. Or maybe neither. Webster said, We need to tease apart whats controlling this pattern of high within-species variation. Theres a lot more work to do. Regardless, evolutionary theory itself was not pictured in any danger. The article did not explain how the complex body types arose almost instantly by an evolutionary mechanism. Instead, it just claimed they emerged rapidly: during the Cambrian Period, more complex creatures with skeletons, eyes and limbs emerged with amazing suddenness. Webster gave his explanation a warm, fuzzy feeling. The article paraphrased him saying that it appears that organisms displayed rampant within-species variation in the warm afterglow of the Cambrian explosion. Trilobites had bilateral symmetry, specialized body segments, articulated limbs for mobility, and some of the most complex eyes known in marine invertebrates (09/18/2003, No precursors to trilobites in earlier strata have been identified. The first trilobites were already fully formed with all their complex organs and structures. Because the data were found to be opposite what evolutionary theory would have predicted, Gene Hunt of the Smithsonian won Stupid Evolution Quote of the Week for the following statements in Science that spun the contrary evidence into support for evolution (words indicative of miracles are highlighted in bold): This study, in establishing the reality of increased Cambrian variability for trilobites, implies that evolutionary processes in the distant past may have acted differently, or in a different balance than in more recent periods of time. The cause or causes for these differences likely relate to the proposed explanations for the extravagant evolutionary inventiveness of this period. These explanations fall into two broad categories: genetic and ecological. The former suggest that Cambrian genomes were less constrained, or otherwise less apt to generate profoundly novel morphologies, whereas the latter invoke the relative sparseness of early animal ecosystems in allowing large evolutionary jumps to become successfully established.Mark Webster also used the term evolutionary inventiveness in the original paper in Science.2 1Gene Hunt, Variation and Early Evolution, Science, 27 July 2007: Vol. 317. no. 5837, pp. 459-460, DOI: 10.1126/science.1145550. 2Mark Webster, A Cambrian Peak in Morphological Variation Within Trilobite Species, Science, 27 July 2007: Vol. 317. no. 5837, pp. 499-502, DOI: 10.1126/science.1142964. When the media, museums and universities are able to propound these magical fairy tales without any critical scrutiny, creationism doesnt stand a chance being heard above the din. Anything goes in ev-illusion (07/27/2007 commentary), including cartoons like Popeye (05/31/2005 commentary).Photosynthesis Requires the Right Kind of Star 07/27/2007 ![]() Where can photosynthesis occur? The answer depends on the energy of starlight, the atmosphere, the amount of water vapor, and the organisms equipped to harvest it. A new kind of photosynthetic bacterium was just discovered in a Yellowstone hot spring (see Science Daily). Exciting as this is (and the discoverer felt he had struck gold), the new species is just another tally among the bacteria and plants with the amazing ability to harvest light and produce energy for food and growth. Some bacteria produce chemical energy from light in one step; plants and algae utilize light in two stages (photosystem I and II), and liberate oxygen in the process an energy-intensive process. They couldnt do it, though, if Earth orbited most stars. John Raven took a look at this coupling between starlight and photosynthesis in Nature.1 He reviewed some recent studies on how light energy penetrates atmospheres and bodies of water. Water is an efficient absorber of solar energy; thats why plants and seaweed are restricted to the photic zone of lakes and oceans, or to the land surface. This biological dark side of water its absorption of solar electromagnetic radiation creates habitats that restrict or eliminate the roles of solar radiation in supplying energy for photosynthesis and information to sensory systems, Raven noted. What is the minimum energy required to trigger photosynthesis? And what is the wavelength of the peak energy reaching the photic zone? These questions yield answers about habitats on planets around other stars. The longest wavelength that has sufficient energy per photon to bring about the appropriate photochemical reaction (in which photon energy is converted into chemical energy) sets physical constraints on photosynthesis, and thus on astrobiology. Raven considered the likelihood that the plentiful M-type (red dwarf) stars could host life: Putative planets associated with stars of the M spectral type are commonly taken to be locations where life might occur, given the abundance of these stars and their longevity. Photosynthetic organisms on an Earth-like planet orbiting an M star would experience stellar radiation with maximum photon fluxes at wavelengths in the infrared spectrum. The average photon would have a lower energy content, and there would also be a much greater absorption by water, than for solar radiation on Earth.This does not rule out life on such worlds, he said, but there are problems: Significant photosynthesis could nonetheless occur on such a planet. But there would be energetic problems in using the relatively low-energy photons to reduce carbon dioxide with electrons from water, with production of oxygen. The mechanism on Earth relies on two photochemical reactions in series; on planets orbiting an M star more than two reactions in series would be required. On any such planet, the longer wavelengths at which photosynthetic pigments would absorb would have implications for the remote sensing of pigments by reflectance spectroscopy as an indicator (with appropriate caveats) of photosynthesis, and hence life.Raven said it cannot be taken for granted that oxygen-producing photosynthesis will be a likely outcome of biogeochemical changes that accompany photosynthesis, as evolutionists believe happened on Earth. Accordingly, in the search for life outside our Solar System, he ended, an astrobiological niche presents itself. Searchers for life around extrasolar planets will have to know what pigments to expect, as well as the signature of oxygen. Speaking of pigments, Freeman Dyson speculated in an article for the New York Review of Books about why plants are green instead of black. Plants only utilize 1% of the incident energy for photosynthesis, he noted. Wouldnt black absorb all the energy of sunlight? Yes, but that fact must be balanced against the need to prevent overheating. Plants absorb at the peak energy of solar radiation but have elaborate mechanisms for dispersing excess heat. Dyson wondered, then, from an evolutionary perspective, why plants are still green in the arctic, when it would seem they need all the energy they can get. If the natural evolution of plants had been driven by the need for high efficiency of utilization of sunlight, then the leaves of all plants would have been black. Black leaves would absorb sunlight more efficiently than leaves of any other color. Obviously plant evolution was driven by other needs, and in particular by the need for protection against overheating. For a plant growing in a hot climate, it is advantageous to reflect as much as possible of the sunlight that is not used for growth. There is plenty of sunlight, and it is not important to use it with maximum efficiency. The plants have evolved with chlorophyll in their leaves to absorb the useful red and blue components of sunlight and to reflect the green. That is why it is reasonable for plants in tropical climates to be green. But this logic does not explain why plants in cold climates where sunlight is scarce are also green. We could imagine that in a place like Iceland, overheating would not be a problem, and plants with black leaves using sunlight more efficiently would have an evolutionary advantage. For some reason which we do not understand, natural plants with black leaves never appeared. Why not? Perhaps we shall not understand why nature did not travel this route until we have traveled it ourselves.From there, Dyson speculated about how humans may some day improve on photosynthesis.2 But perhaps he is right; plants know something we dont. They are obviously very good at making use of the light falling on Gods green Earth as Michael Medved calls it when signing off his radio program each day. Gods black Earth somehow wouldnt sound as nice. 1John Raven, Astrobiology: Photosynthesis in watercolours, Nature 448, 418 (26 July 2007) | doi:10.1038/448418. 2As typical for the futurist Dyson, his article is filled with wild speculations about the future of evolution and civilization unfettered by logistics and eternal values, but thats beside the point of this entry. Solar radiation is also just the right energy for the transitions in rhodopsin in our retinas that allow us to see the green plants. The fine-tuning is observational fact; the evolutionary speculation is superstition. Thats what we should call it. Superstition is believing something totally without evidence, like believing a rabbits foot will bring good luck. Actually, one could adduce evidence selectively in favor of a superstition, and that is what evolutionists do. A child has a lucky day and thinks it proves the rabbits foot worked (selectively ignoring the owie of the day). An evolutionist sees the success of photosynthesis and thinks evolution was responsible. Whats the difference? Dyson and Raven may envision exotic bacteria around an M-star with multiple stages of photosynthesis to harvest infrared light using black, purple and mauve pigments, but that is illusion. [light bulb] Hey; that gives us an opportunity to coin a new word to describe Darwins brand of science, the result of superstitiously speculating in the absence of evidence: ev-illusion.Origin of Life: Speculation vs. Evidence 07/27/2007 ![]() The European Astrobiology Magazine reviewed a book1 that tries to give detailed scrutiny the problem of the transition from small, simple molecules to large, complex cells. The initial reaction by reviewer Toby Murcott points out glaring problems in origin of life research: uncertainty, lack of consensus, and lack of evidence: What hits you immediately about this subject is the large amount of uncertainty and the many different possible scenarios. Concerning the transition from prebiotic chemistry to life, there is no clear evidence of chronology. There are many different pathways from pre-biotic soup to living organisms, and numerous possible intermediate stages with any number of complex organic and biochemical reactions en route. Its also clear that the biochemicals of today may have performed very different functions in the past. For example, the majority of chemical reactions are today mediated by protein enzymes but some indications from biology suggest that RNA was widely used as a catalyst during early chemical evolution.The tone of uncertainty was not mitigated by evidence in the article. The word perhaps appeared 4 times, possible twice and impossible to say once, scenario four times, uncertainty twice, may and might a dozen times. We know that todays organisms rely on proteins, amino acids, fats and sugars, But just what happened and in what order is a matter of much debate and likely to remain so for some time. Specifically, Three different scenarios for chemical evolution are discussed in the review; co-evolution; self-replicating peptides and the RNA world. How did these three fare? About the co-evolution scenario, It is the simplest of the models, requiring perhaps the least detailed explanation but it is not a particularly satisfying description. For self-replicating peptides, There is, as yet, no convincing rationale for this transition and whats more, there is no hint of PNA in any modern organism, the reviewers said, adding this speculation: While that does not rule it out, both biochemical and Darwinian evolution are expected to leave detectable traces of their heritage behind. That leaves the RNA world by default. It gets the most attention, but a key step is a big hurdle: However, an efficient prebiotic pathway for nucleotide synthesis remains to be found. In short, origin-of-life research is big on speculation and short on evidence. Maybe astrobiology could help, Murcott said in conclusion, by actually finding some exotic life somewhere someday: This book covers every element of the evolution of life from the emergence of simple organic molecules to theories on how the first cells might have got together. How did groups of chemicals and their associated reactions become compartmentalised into prototype cells? What was the involvement of inorganic matrices and, the big one, how did complexity arise from simple origins? The authors painstakingly pore over the limited evidence and make intelligent, though guarded, speculations as appropriate. Anyone who is not comfortable with biochemistry might struggle at times but the summaries are less intense and will allow virtually all readers to grasp the concepts and uncertainties. In describing the problem of how life emerged the authors also illustrate why astrobiology might provide one of the few experimental opportunities to test the hypotheses. 1From Suns to Life: A Chronological Approach to the History of Life on Earth, edited by M. Gargaud et. al. and reprinted from Earth, Moon, and Planets, Vol. 98/1-4, 2006. Its all futureware, speculation, smoke and mirrors, bluffing and ignorance. Dont let anyone fool you into thinking this is scientific. The use of scientific instruments does not justify calling this science. Alchemists used the best instruments available and even came up with many useful techniques for physical chemistry. Their findings about what did not make gold proved useful when the real science of chemistry supplanted alchemy. But none of the effort, the experimentation, the writing, or the speculation justified the premise of alchemy at all. Similarly, astrobiologists and chemical evolutionists are revising experimental methods and learning many things about chemicals while ruling out scenarios that prove hopeless for evolving life. What remains is a bundle of raw speculation that has not yet been ruled out. Speculation is not science. If efforts to confirm the speculation result in some interesting scientific observations on the side, well and good for those observations, but the bundle of speculation itself is indistinguishable from modern alchemy a fun trip on a dead-end road. Someone quipped, if you dont care where you are going, you aint lost. We think people should care. You may be lost and not know it yet.The Simpsons Producer Treats Evolution as Fact 07/26/2007 ![]() The TV cartoon The Simpsons was praised for its greatness in, of all places, the premiere scientific journal Nature.1 Michael Hopkin interviewed Executive producer Al Jean, the shows head writer and a Harvard mathematics graduate. One of the questions was, One episode in which the show does take sides is the one in which Lisa protests against creationism in her school. Jean explained the thinking behind the episode: What we say is that there are conservatives, like Pope John Paul II, who believe in the theory of evolution, and that its far from a liberal theory: its scientific, its as close to a fact as can be. We did say that Flanders, who opposed the teaching of evolution, is sincere in his beliefs. We tried to take his emotions seriously.Jean did not explain what he meant by evolution, but since it was put in contradistinction to creationism one could safely infer he meant the common ancestry of all organisms by an unguided, undirected process that did not include a designing intelligence. Because of that, and for assuming the factual objectivity of the most controversial theory in science and philosophy, and for propounding a grade-school-level philosophy of science, he wins Stupid Evolution Quote of the Week. For the Popes most recent statement about evolution, see this translation of his July 25 speech posted by ID Net.2 1Michael Hopkin, News Feature: Science in comedy: Mmm... pi, Nature 448, 404-405 (26 July 2007) | doi:10.1038/448404a. 2This is provided for reference only. CEH makes no claim that the Popes opinions on this matter carry any particular credibility or authority. Since his words were widely reported in sound bites, however, one should view them in their context. We think people need to be reminded that cartoons dont just drop out of the sky into TV sets from unbiased sources. They are the work of producers, writers, and publicists who are just as biased as anyone else. Youve just seen a portion of the mindset of the executive producer of a popular cartoon that always portrays the father as a bozo, the son as a delinquent, the religious leader as the sincere fool, and the girl who adores science as the savior of society from dangerous myths like creationism. Why do you think they do this? No agenda at all, would you say? Theres nothing like humor to slip propaganda past the family radar.Stars Found Almost as Old as Universe 07/25/2007 ![]() A new record was set by a Caltech team using the Keck telescopes on Hawaii: they detected a galaxy nearly as old as the universe. The consensus age for the universe is 13.6 billion years. The light from this galaxy, they claim, is over 13 billion years old a mere 500 million years after the Big Bang itself was supposed to have brought the universe into being. The discovery was reported by the BBC News based on a paper in the Astrophysical Journal.1 Some astronomers are questioning the accuracy of the report and its use of gravitational lensing to see the distorted light from the distant galaxy, but agree the work was done carefully. This exceeds the previous redshift record (z = 6.96) into the 8 to 10 range. The authors found six candidates and proposed that at least two of them are real, and may lie at redshifts close to or beyond z=10. They assumed metallicities of 1/20 solar abundance. This means that heavy elements (metals) would have had to be products of a prior generation of hydrogen stars. The authors also believed that their candidate galaxies were representative of a large abundance of similar low-luminosity galaxies that were present in that epoch. 1Stark, Ellis et al, A Keck Survey for Gravitationally Lensed Lyman-Alpha Emitters in the Redshift Range 8.5 < z < 10.4: New Constraints on the Contribution of Low-Luminosity Sources to Cosmic Reionization, The Astrophysical Journal, 663:10-28, 2007 July 1. These measurements are indirect and tentative. Confirmation must await observations from the refurbished Hubble, the James Webb Space Telescope, and refinements of the gravitational lensing technique. There is also a fuzzy line between observation and theory in cases such as these. Even using their own assumptions, however, the situation is paralleled by that in biology: more maturity and complexity as far back as they can see.Dinosaur Sex and Other Tales 07/24/2007 ![]() How much do we really know about dinosaurs? How much can be inferred from their bones? Two recent stories illustrate conflicting themes: much of what we thought we knew was wrong, but that doesnt stop evolutionary paleontologists from speaking with confidence.
1 Irmis, Nesbit, Padian et al, A Late Triassic Dinosauromorph Assemblage from New Mexico and the Rise of Dinosaurs, Science, 20 July 2007: Vol. 317. no. 5836, pp. 358-361, DOI: 10.1126/science.1143325. The dates and claims are all poppycock, you realize, because they have been falsified with the soft tissue (04/12/2007) and protein (11/26/2006) found in that T. rex bone (11/11/2006). We already know that dinosaur bones cannot be as old as claimed. The evolutionary paleontologists are living in Fantasyland to deny it. Alan Boyle, bless his low-rating MSNBC heart, wrote in his column today about dinosaurs soft spots and said soft tissue has been turning up in specimens as far apart as Madagascar and Montana. Looking inside the bones for soft tissue remains opens up a whole new book of information on dinosaurs, he said, and tells how the soft tissue, once exposed to the air, rapidly decays yet he still fails to question the ages! He repeats the dates without any twinge of conscience: Seventy million years ago, a killing drought was followed by torrential rains, which sent waves of mud and wet sand to cover up dead and dying dinosaurs, he said, like an actor rehearsing the lines of a fictional play. And these are the people you trust to tell us about dinosaur sex lives?Cosmologists in Search of Dark Ghosts 07/23/2007 ![]() Dark matter and dark energy: do they exist? Cosmologists and physicists are spending large amounts of money building huge and expensive detectors to find them, but so far have found nothing. This raises profound questions about the limits of science, the interaction of observation with theory, the presuppositions behind scientific models, and the sociology of the scientific community. The universe, clearly, owes no obligation to scientific models; it is what it is. If scientists were to pursue a false path in their search for understanding, how long could they be wrong? For a thousand years? Two articles in Nature explored the search for dark stuff. Jenny Hogan wrote about the search for dark matter,1 and Geoff Brumfiel wrote about the search for dark energy.2 In short, the dark matter search seems more promising than the dark energy search. Jenny Hogan reports that attempts to identify the mysterious dark matter are on the verge of success, The heading before the two articles reads. In the second, Geoff Brumfiel asks why dark energy, hailed as a breakthrough when discovered a decade ago, is proving more frustrating than ever to the scientists who study it. Yet even Hogans dark-matter article contains some disturbing revelations. After describing large tanks of xenon and argon deep in European and American tunnels that hope to feel the bumps of passing dark matter particles, and the race to be the first scientist to detect them, she admitted, Despite the enthusiasm, there is still a chance that nature will refuse to cooperate, and the experiments will chase ever better limits but never detect a particle. Some of the feverish activity behind the search has the feel of a snipe hunt or ghostbusters escapade. No one knows what dark matter is, but they know what its not. Its not part of the standard model of physics that weaves together everything that is known about ordinary matter and its interactions. The standard model has been hugely successful, but it also has some problems, and in trying to fix these, theorists have predicted hordes of new fundamental particles. At first, these hypothetical particles were viewed as unwelcome additions, but now some of them are leading candidates for dark matter. These days a theory without a dark-matter candidate is not considered an interesting one, says [Leszek] Roszkowski [CERN]. The existence of the dark-matter problem is perhaps the most convincing evidence for physics beyond the standard model.Could it be that the community of physicists has jumped on a fast-moving bandwagon going nowhere? They give names to theoretical entities: neutralinos, gravitinos, axions, and other things with exotic names, which might not even exist. The scientists talk about weakly-interacting massive particles, or WIMPs, and tell us that 10 billion of them pass through every square meter of the Earth every second yet no instrument, no matter how sensitive, has ever detected one. Even the Large Hadron Collider at CERN, going into operation next year, will not be able to detect their presence with certainty: Because such evidence is indirect, finding a WIMP signature at the LHC would not confirm it to be dark matter, Hogan acknowledged. Why, then, do theoretical physicists and cosmologists believe they exist? Part of the reason comes from observations dating from the 1930s that galaxy clusters seem too loosely bound gravitationally to keep from flying apart over billions of years. The belief also stems from physical theories about the nature of gravity and fundamental particles. Having elegant models and expensive instrumentation, however, cannot legitimize a belief that fails observational confirmation. But even if observations find a ghostly particle, dont expect that there is only one kind of ghost. Hogan ended with this escape clause for the theorists: Dark matter might prove to be a richer problem than anyone is expecting. [Max] Tegmark [MIT] hopes for this outcome. This could be a wonderful surprise. Its very arrogant of us humans to say that just because we cant see it, theres only one kind of dark matter.Critics might see this as job security for people with vivid imaginations. And that was the good news. Searchers for dark energy have even bigger problems. Geoff Brumfiels article contains a strange mix of observation and theory. It is commonly reported that the universe is flying apart faster than cosmologists expected from the normal expansion of the universe but that presupposes acceptance of inflationary big-bang cosmology. Inflation was invented to solve the flatness problem. Our universe is finely balanced between its density and expansion rate. Explaining this degree of fine tuning naturally has been a challenge for cosmologists for decades. Inflation seemed to solve it by positing a rapid, exponential expansion in the early stages of the big bang. Brumfiel wrote, the expansion provided a way out of a theoretical impasse. Observations of the Big Bangs afterglow made by various groups, including Bennetts, indicated that the Universes gravity had flattened it out. As happens so often in science, a solution breeds new problems. There didnt seem to be enough matter to have this effect on space-time. Enter dark energy: it turned out that the amount of energy needed to drive the acceleration was pretty close to that needed to solve the flatness problem by means of its gravity, he wrote. This created initial excitement in 1998 when evidence for an accelerating universe was announced. Dark energy, he said, seemed poised to provide great insight into the origin and future of the cosmos. Those hopes have been replaced by bigger problems: But a decade further on, researchers seem to have swapped one theoretical conundrum for a bigger one. Follow-up measurements have revealed little about the nature of dark energy, and theories to explain it have failed to gain traction. And although astronomers are trudging forwards with a battery of new measurements, there is little guarantee that any will solve the problem and thus no clear consensus on how much effort to put into them. The issue is: how much information do we get from these future observations? asks Avi Loeb, an astrophysicist at Harvard University.The fine-tuning of the expansion has caused some, like Leonard Susskind (Stanford), to propose a nearly infinite multiverse in which our universes vacuum energy is just right to allow for stars and planets and life (see 12/18/2005, 01/04/2006, 08/11/2006). While others dislike the anthropic implications of this view, nothing better has been proposed that does not create more problems than it purports to solve: This sort of anthropic argument irks many scientists. Critics say such reasoning is almost impossible to verify and doesnt provide any deeper insight into the cosmos. Anthropics and randomness dont explain anything, says Paul Steinhardt, a theorist at Princeton University in New Jersey. Im disappointed with what most theorists are willing to accept.So how far can a cosmologist go before admitting defeat? As far as he wants. Secular cosmologists never want to give up and just say that things are as they are because they were as they were, as Thomas Gold once joked. The search for ultimate answers is part of the game. So the observationalists will continue to build huge detectors, trying to sharpen measurements that might nail down the equation of state of the universe to finer degrees of precision, while the theoreticians, arguing that observations can only describe but not explain, will continue to theorize exotic particles. When the particle zoo gets too cumbersome again, a new, more fundamental theory will be erected with smaller, more abstruse building blocks. No matter how frustrating or hopeless, no matter how far off course, the show must go on: this is the game of secular science. Being right is no fun. Exasperation is the angst that propels the game onward, right or wrong. Here is how Brumfiel ended his article: For now, many in the field are left with a sense of unease: the tantalizing clue they thought they had discovered has turned into an exasperating mystery. And with no clear explanation of something that could be up to three-quarters of everything out there, its hard not to feel like youre missing a big part of the picture, Susskind says. We could be wrong about cosmology for the next thousand years. Deeply wrong. 1Jenny Hogan, Unseen Universe: Welcome to the dark side, Nature 448, 240-245 (19 July 2007) | doi:10.1038/448240. 2Geoff Brumfiel, Unseen Universe: A constant problem, Nature 448, 245-248 (19 July 2007) | doi:10.1038/448245a. They cant even figure out our nearest star (the sun) and they want to tell us about the ultimate origins and fate of the universe and even of multiple universes that would be beyond observation even if they existed. What unconscionable arrogance.Human Variability May Swamp Ancestral Hominid Claims 07/22/2007 ![]() Here are some things to think about when paleoanthropologists draw inferences from fossils alleged to be human ancestors. A seven-foot-nine-inch man in Mongolia just married a lady more than two feet shorter (see picture at National Geographic). And a man with just a narrow rim of brain material inside his skull had no symptoms except a weakness in his leg, reported News@Nature. More than half his skull was filled with a huge pocket of fluid where most of his brain ought to be, yet the man was married with two children and had a steady job as a civil servant. After the fluid was removed, he returned to normal, but a subsequent scan showed no change in his brain size. So the man with the tiny brain lives on. Evolutionary anthropologists make a big deal out of brain size (as inferred from skull capacity), but look how normal this mans tiny brain functioned inside a normal skull. This calls into question any measure of intelligence based on skull capacity. And might not they have classified Mr. Bao Xishun and his bride as separate species?We Live in a Rare Solar System 07/21/2007 ![]() Surveys of extrasolar planets are making our solar system look unusual. Most stars that host a family of planets have the gas giants close in, an article on Space.com states. The hot Jupiters seen around many stars would most likely eject any rocky planets from the habitable zone. Of the nearly 250 planets discovered so far outside our solar system, most are gas giants that orbit extremely close to their stars. The observations may be a selection effect. Its easier to detect hot Jupiters than distant ones. A team from University of Arizona looked for gas giants at the 10 AU range, assuming that young gas giants would be brighter. They found none around 54 nearby stars. This could mean that gas giants at large radial distances are too faint to detect, or that they are rare. Current theory also predicts that gas giants would be less common the farther away from the star. The two leading theories about how planets formcore accretion and disk instabilityhave problems making gas giants out at distances beyond 20 AU. In our solar system, Jupiter is at about 5 AU, Saturn at 10, Uranus at 20, and Neptune at 30. This arrangement allows a suite of rocky planets (Mercury, Venus, Earth, and Mars) to occupy stable orbits closer in to the sun. The Earth-Moon system occupies the narrow sweet spot called the continuously habitable zone. A more speculative article on Space.com claimed that signatures of heavy elements on some stars might indicate that planets had fallen in. The article claims that this might support the disk instability theory which suggests planets form rapidly from knots in the debris disk. These inferences were only made indirectly from spectra, however, not from actual observations of planets impacting their host stars. But if validated, it would indicate another hazard in making solar systems: keeping a planetary system in orbit safely out of reach of the planet-eating monster. How many AU is the Earth from the sun? Exactly one! Thats a silly question, because the astronomical unit (AU) is defined in terms of the sun-Earth distance. Impress your gullible friends with this coincidence.Harnessing Cellular Machines for Humans 07/20/2007 ![]() The cell is loaded with molecular machines, so why reinvent the wheel? or the whole truck? Martin G. L. van den Heuvel and Cees Dekker wrote in Science that engineers ought to put the existing technology to work.1 The biological cell is equipped with a variety of molecular machines that perform complex mechanical tasks such as cell division or intracellular transport. One can envision employing these biological motors in artificial environments. We review the progress that has been made in using motor proteins for powering or manipulating nanoscale components. In particular, kinesin and myosin biomotors that move along linear biofilaments have been widely explored as active components. Currently realized applications are merely proof-of-principle demonstrations. Yet, the sheer availability of an entire ready-to-use toolbox of nanosized biological motors is a great opportunity that calls for exploration.Its time to put these ready and willing workhorses to work. Their illustration shows diagrams of ATP synthase and a bacterial flagellum, kinesin, dynein, myosin and RNA polymerase. Of the flagellum, they said, This powerful motor, assembled from more than 20 different proteins, is driven by an inward proton flux that is converted by several torque-generating stators into a rotary motion of the cylindrical rings and central shaft. They reviewed the various motors and experiments to date to harness and control them. Some day we might use cellular motors to sort, assemble, concentrate or manufacture materials on demand. Or, we might try to copy them from scratch with our own building blocks. But why do that? The small size and force-exerting capabilities of motor proteins and the range of opportunities for specific engineering give them unique advantages over current human-made motors, they said. The sky is the limit; the field seems limited only by our own imaginations. Upon studying and using biomotors, we will gather a lot of knowledge that is of interest to biology, material science, and chemistry, and it is reasonable to expect spin-offs for medicine, sensors, electronics, or engineering, they concluded. The exploration of biomotors in technology will thus remain an interdisciplinary playground for many years to come. Oh, one other thing. They did make a quick comment about where these machines came from. Here is paragraph two of their article: A huge amount of biological research in recent decades has spurred the realization that the living cell can be viewed as a miniature factory that contains a large collection of dedicated protein machines (1)2. Consider the complicated tasks that a single cell can perform: It can create a full copy of itself in less than an hour; it can proofread and repair errors in its own DNA, sense its environment and respond to it, change its shape and morphology, and obtain energy from photosynthesis or metabolism, using principles that are similar to solar cells or batteries. All this functionality derives from thousands of sophisticated proteins, optimized by billions of years of evolution. At the moment, we can only dream of constructing machines of similar size that possess just a fraction of the functionality of these natural wonders.While were on the subject, lets look at a cellular device that recently got more praise: the cilium. This little rod-like projection on most cells is doing more work than previously thought. Appreciation is now growing for primary cilia, said Christenson and Ott in Science,3 primary cilia being the nonmotile counterparts, present as a single copy on the surface of most cell types in our body. If primary cilia dont beat and wave like the moving kind, what do they do? Well, for one thing, they function as unique antenna-like structures, probing the extracellular environment for molecules that are recognized by the receptors they bear. This sensory function allows primary cilia to coordinate numerous intercellular signaling pathways that regulate growth, survival, and differentiation of cells during embryonic development and maintenance of healthy tissues. New research shows that a suite of molecules move in a coordinated fashion in and out of the cilium, creating a powerful switch by which cells can turn on and off a set of signaling pathways. Thats pretty cool for an complex antenna previously thought to be nothing more than a little bitty hair on a tiny cell.4 1Martin G. L. van den Heuvel and Cees Dekker, Motor Proteins at Work for Nanotechnology, Nature 20 July 2007: Vol. 317. no. 5836, pp. 333-336, DOI: 10.1126/science.1139570. 2This reference was to Bruce Alberts 1998 paper that made a similar statement, calling the study of molecular machines the biology of the future (see 01/09/2002). 3Søren Tvorup Christensen and Carolyn Marie Ott, Cell Signaling: A Ciliary Signaling Switch, Science, 20 July 2007: Vol. 317. no. 5836, pp. 330-331, DOI: 10.1126/science.1146180. 4The ones that move are way cool: see 12/19/2005, 03/12/2001. So, thousands of sophisticated proteins, optimized by billions of years of evolution. Gimme a BREAK!
How cilia are made: little ore-carts deliver the parts, from 06/14/2004.
Keep the Stem Cell News Straight 07/19/2007
1Hashi et al, Antithrombogenic property of bone marrow mesenchymal stem cells in nanofibrous vascular grafts, Proceedings of the National Academy of Sciences USA, 104: 11915-11920; published online before print July 5 2007, 10.1073/pnas.0704581104. 2Redmond et al, Behavioral improvement in a primate Parkinsons model is associated with multiple homeostatic effects of human neural stem cells, Proceedings of the National Academy of Sciences USA, 104: 12175-12180; published online before print June 22 2007, 10.1073/pnas.0704091104. 3Janet Rossant, Stem cells: The magic brew, Nature 448, 260-262 (19 July 2007) | doi:10.1038/448260a. 4Lyerly and Faden, Willingness to Donate Frozen Embryos for Stem Cell Research, Science, 6 July 2007: Vol. 317. no. 5834, pp. 46-47, DOI: 10.1126/science.1145067. 5Constance Holden, Stem Cell Science Advances as Politics Stall, Science, 29 June 2007: Vol. 316. no. 5833, p. 1825, DOI: 10.1126/science.316.5833.1825. 6M. Ian Phillips, Passage to Global Stem Cells, Science, 20 July 2007: Vol. 317. no. 5836, p. 322, DOI: 10.1126/science.1146229. 7Dennis Normille, Singapore Firm Abandons Plans for Stem Cell Therapies, Science, 20 July 2007: Vol. 317. no. 5836, p. 305, DOI: 10.1126/science.317.5836.305. Do you ever wonder how the entire international scientific community can seem to be unanimously in favor of Darwinism, unanimously anti-Bush, and all in agreement that humans are to blame for global warming? Just look at the official party line about stem cells. Certainly there are hundreds, if not thousands, of ethically-sensitive researchers who are pursuing adult stem cells and legitimate therapies to help the afflicted. They have made great strides. Why, then, is the editorial staff of Nature, Science and the other spokespersons for Big Science pursuing the vain hope of ES cells, when they have nothing but scandals and empty promises to show for it?Its Not a Bird, Its a Plane 07/18/2007 ![]() Look to the birds of the air, and they will teach you aeronautics. Thats what designers of the Robo-Swift did. PhysOrg reported about a new plane that imitates a swift thing on the wing: RoboSwift is a micro airplane fitted with shape shifting wings, inspired by the common swift, one of natures most efficient flyers. The micro airplane will have unprecedented wing characteristics; the wing geometry as well as the wing surface area can be adjusted continuously. This makes RoboSwift more maneuverable and efficient. Resembling the common swift, RoboSwift will be able to go undetected while using its three micro cameras to perform surveillance on vehicles and people on the ground.The article says that RoboSwift, designed by Dutch engineers, will also be able to fly along with swifts and study them up close. One can only imagine what would be going through a swifts bird brain upon seeing such a thing. (See also the 04/29/2007 story on swifts.) Scientists continue to learn more about bird flight. Birds seem to break the rules of aerodynamics, reported MSNBC News. But that can only mean that we dont understand the rules very well yet. Bird maneuverability vastly exceeds mans aircraft. PhysOrg explained that a new study of 138 bird species overturns aerodynamic scaling rules that explain how flight varies according to weight and wing loading. Their analysis reveals that the difference between the speed of small and large birds is not as great as expected; they suggest that this surprising result is likely to be the result of disadvantages associated with very slow speeds among smaller birds and with very fast speeds for larger birds. They also show that the evolutionary history of the species helps explain much of the variation in flight speed: species of the same group tend to fly at similar characteristic speeds. For example, birds of prey and herons had slow flight speeds, on average, given their mass and wing loading, whereas the average speed for songbirds and shorebirds was faster than would be predicted.Yet it would seem hard to claim knowledge of evolutionary history in the past when the article goes on to say that there exists a diversity of cruising flight characteristics among birds that remain to be explored and understood in the present, right under our noses. David Tyler, writing for Access Research Network, has explored which paradigm design or evolution is more suited to the explosive rise in biomimetic engineering. Scientists should be swift to learn, slow to mythologize. Evolutionists could not begin to explain how a lumbering dinosaur got the right combination of mutations to turn into a flying swift with aerodynamic engineering that is the envy of our smartest inventors. Evolutionary claims are vacuous and useless. Give us RoboSwifts and other useful inventions inspired by nature as long as the government doesnt use them to spy on honest citizens.Mosquitos Are Water-Walking Champions 07/18/2007 ![]() We hate em, but in one sense we should admire them: mosquitos are the water-walking champions of the animal kingdom. They even beat out water striders, reported Live Science and EurekAlert based on research from Physical Review E. Science Daily wrote of miraculous mosquito legs and had a picture of the intricate fan-shaped superhydrophobic structures that allow mosquitos to comfortably stand on the surface of water like a cat on a feather pillow. The legs of water striders can support 15 times their weight on water, but mosquito feet can support 23 times their weight. The secret to mosquito water walking appears to be feathery scales a few microns across that in turn are covered with nanoscopic ribbing, forming what the physicists have dubbed (in an apparent fit of excessive prefixing) a micronanostructure. Thats something to think about before swatting. Like geckos, mosquitos take advantage of millions of tiny hairy pads that can adhere to about anything. Speaking of geckos, PhysOrg reported a new super glue product that was inspired by gecko feet and mussels. Its called geckel (gecko + mussel) and has been shown to endure 1,000 repeated applications. It even works underwater. National Geographic also reported on the nature-inspired invention. You have to wonder how such intricate micro-machines like mosquitos got to be so nasty. If they didnt desire our blood and carry diseases, we would probably not notice them or mind them. Did they have a beneficial purpose originally, like many other insects still do? Did they pollinate plants or provide food and games for bats and toads? Did something go wrong after the original creation? Thats a question science cannot answer, but theologians can and do try to incorporate the observations of todays world into the limited record of creation that has been revealed. Its clear from the Bible that God has on many occasions used his creatures as agents of judgment but it is also clear that not every instance of a natural disaster or handicap is related to a specific sin by the victims. Laymen might retreat to rhymes like: I dont know why God made the fly, the mosquito, gnat or chigger; Im just not sad, but indeed glad, he didnt make them bigger.Council of Europe anticreationist manifesto defeated: see 06/22/2007 update.
Iapetus, Charon Look Young for Their Age 07/18/2007
You never see these planetary scientists proving the solar system is billions of years old. You only see them assuming it. Then, because that parameter cannot be altered, you see them squirm and wriggle the models to fit young-looking phenomena into old ages. Proposing an ad hoc set of conditions that might fit the data is not the same as proving this is what happened, so National Geographic was way out of line to claim the mystery of Iapetus has been solved. Diatoms crown jewels make nanotechnologists drool,
from 07/21/2004.
News Reporters Knuckling Under to Darwinian Storytelling 07/17/2007
The original paper itself, in fact, did not address these questions. Sockol, Raichlen and Pontzer only measured the energy cost of locomotion in modern humans and modern chimpanzees, assuming this was a determining factor in the rise of human bipedalism. In their words, this was the extent of the investigation: Here, we compare human and adult chimpanzee locomotor energetics and biomechanics to determine links among anatomy, gait, and cost. Our study focuses on two primary questions. First, do adult chimpanzees follow the pattern of costs found previously for juveniles? Second, do differences in anatomy and gait between bipedal and quadrupedal walking, as well as between chimpanzees and humans, explain observed differences in cost? Using this biomechanical approach to link differences in anatomy and gait to cost, we then examine what changes, if any, would lower the cost of bipedalism for an early hominin, such that bipedalism would be more economical than the ape-like quadrupedalism of the last common ancestor.Thus, from the beginning, they merely assumed that there was an evolutionary last common ancestor of apes and humans, though no record of it exists. This begs the question that humans evolved bipedalism from non-bipedalism. Even so, in the end they admitted that their measurements could only in principle play some role in the story, not explain all the adaptations required for upright locomotion: Our results, therefore, support the hypothesis that energetics played an important role in the evolution of bipedalism. Unfortunately, a lack of postcranial evidence from the earliest hominins and their immediate forebears prevents us from testing the hypothesis that locomotor economy provided the initial evolutionary advantage for hominin bipedalism. However, regardless of the context under which bipedalism evolved, our biomechanical analysis of adult chimpanzee costs, coupled with previous analyses of early hominin pelvic and hindlimb morphology, suggests that improved locomotor economy may have accrued very early within the hominin lineage. Future fossil discoveries from the earliest hominins will resolve whether this energetic advantage was in fact the key factor in the evolution of hominin bipedalism.Raichlen, one of the authors, won a runner-up for Stupid Evolution Quote of the Week with this short line: We think about the evolution of bipedalism as one of first events that led hominids down the path to being human. William Jungers, the winner, topped this with: Evolution needed a foot in the door, and we kind of got a snapshot of that here, which is kind of cool. 1Michael D. Sockol, David A. Raichlen, and Herman Pontzer, Chimpanzee locomotor energetics and the origin of human bipedalism, Proceedings of the National Academy of Sciences USA, 10.1073/pnas.0703267104, published online before print July 16, 2007. You have just seen another gratuitous, egregious, rambunctious, atrocious, nefarious, preposterous, loquacious, bodacious example of Darwin foot-kissing (cf. 11/19/2004). Measurement of modern-day chimpanzees and humans has nothing to do with the evolution of upright posture, unless you already have sold your brain to the idea of evolution. What does it mean? Only that five chimpanzees, under artificially controlled conditions, spent a little more energy walking around on the ground with their knuckles than four human subjects did walking upright. Big deal! Guess what: chimpanzees spend much of their time climbing trees, for which they are well adapted.Cool Cell Tricks 07/16/2007 ![]() Some cell parts act like acrobats, some like rescue workers, and some like I.T. professionals. Here are some recent stories about the tricks that living cells perform each day.
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