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From Sciencedaily: New research from The University of Texas at Austin reveals that the Earth’s unique iron composition isn’t linked to the formation of the planet’s core, calling into question a prevailing theory about the events that shaped our planet during its earliest years. Lin said that one of the most popular theories to explain the Earth’s iron signature is that the relatively large size of the planet (compared with other rocky bodies in the solar system) created high pressure and high temperature conditions during core formation that made different proportions of heavy and light iron isotopes accumulate in the core and mantle. This resulted in a larger share of heavy iron isotopes bonding with elements that make up the rocky Read More ›

From Andy Coghlan at New Scientist: A study has now revealed how this genetic legacy is still controlling how some people’s genes work, with possible consequences for their health. But note this: Tellingly, the Neanderthal influence has waned fastest in parts of the body that evolved most rapidly around that time, especially the brain. It suggests that once our direct human ancestors had evolved the equipment for sophisticated language and problem-solving, mating with Neanderthals – and the DNA that came with it – rapidly fell out of fashion. That’s a vast speculation based on minimal evidence about a subject on which we know very little, charitably put. The most reasonable explanation for what happened to the Neanderthals is that they Read More ›

From ScienceDaily: These new results indicate that the Asian Horned Frogs family may have originated as recently as 77 million years ago in contrast to 100-126 mya as previously estimated, and suggest that scientists might have been also overestimating the age of many other families of frogs by up to 35%. The results have completely changed our understanding of how the different Asian Horned Frog species and their species groups are related. Many of the species that look similar, and so were considered to be closely related, were found to be distant relatives of each other, and those that look different were found to be closely related. Paper. (public access) – Stephen Mahony, Nicole M. Foley, S.D. Biju, Emma C. Read More ›

From Laura Geggel at LiveScience: Archaeologists found 16 limestone tablets dating to the Aurignacian period, named for the first known people to settle in Europe. The tablets were engraved with pictures of horses, mammoths and aurochs (extinct wild cows). Most notably, the pictures were drawn using a series of dots and lines — or as archaeologists call the technique, pointillism. Modern pointillism was invented in the 1880s by Georges Seurat and Paul Signac, who developed the technique by using small dots to create the illusion of a larger image. Other artists, including Camille Pissarro and Roy Lichtenstein, followed suit. More. We know we are dealing with stasis in human evolution when we now find ourselves referring to “modern” pointillism. See Read More ›

From Andrew Jenner at Atlantic: In July 2008, an American ornithologist named Bret Whitney was researching antbirds in the Brazilian Amazon when he heard a curious bird song. The sound, to his expert ear, clearly belonged a Striolated Puffbird––a big, streaky creature that looks like an owl crossed with a kingfisher. But it also had a smoother quality that struck him as “off-the-charts different” from the slightly warblier songs he knew from elsewhere in the region. He divided the Puffbird into an additional three new species, based on this information but in the ensuing dispute the American Ornithological Society was willing to recognize only one new species: Failing to see the logic behind this decision, Whitney regards it as “just Read More ›

For the crisis, go here. For the “challenges,” see Anna Ijjas, Paul J. Steinhardt, and Abraham Loeb at Scientific American: The latest astrophysical measurements, combined with theoretical problems, cast doubt on the long-cherished inflationary theory of the early cosmos and suggest we need new ideas. (paywall) More. We remember when inflation was beyond dispute. It promised naturalists a multiverse. But science is now merely one expression of naturalism, so we can be sure that doubts about inflation will not cause doubts about the multiverse. See also: Crisis in cosmology: Universe expanding too fast? Follow UD News at Twitter!

From Kelly Rae Chi at Nature: n 2004, oncologist Gideon Rechavi at Tel Aviv University in Israel and his colleagues compared all the human genomic DNA sequences then available with their corresponding messenger RNAs — the molecules that carry the information needed to make a protein from a gene. They were looking for signs that one of the nucleotide building blocks in the RNA sequence, called adenosine (A), had changed to another building block called inosine (I). This ‘A-to-I editing’ can alter a protein’s coding sequence, and, in humans, is crucial for keeping the innate immune response in check. “It sounds simple, but in real life it was really complicated,” Rechavi recalls. “Several groups had tried it before and failed” Read More ›

From Jordana Cepelewicz at Nautilus, on mathematician Harvey Friedman: The foundations of mathematics is also a field—in stark contrast to the casual and light tone of Friedman’s emails—that has been in crisis for nearly a century. In 1931, the Austrian mathematician and philosopher Kurt Gödel proved that any logical system adequate to develop basic arithmetic gives rise to statements that cannot be proven true or false within that system. One such statement: that the system itself is consistent. In other words, no system can ever prove itself to be free of contradiction. The result seemed to present an insurmountable problem for mathematicians, not so much because it prevented them from ever knowing whether the system their work is built on Read More ›

An unexpectedly level-headed discussion from Tom Mahony at RealClearScience: Ironically, true believers often moralize about the importance of facts and insist they’re the only ones who are “reality based.” However, in practice, they confuse facts with assumptions, beliefs, conjecture, and opinion. If you take an incorrect assumption, assume it as fact, and extrapolate from that assumption, even if the logic of the extrapolation is sound, the whole idea is wrong because the foundational assumption is wrong. Garbage in, garbage out. Yet, since true believers mistake their incorrect assumption for fact, and tout their impeccable extrapolation, you’re the kook. This is what passes for logic in the true-believer community. True believers haunt any subject: science, religion, health, history, economics, politics. The Read More ›

From Robin Nixon, Elizabeth Peterson and Karen Rowan (October 2016) at LiveScience: 25 Medical Myths that Just Won’t Go Away Despite what you may have heard, drinking eight glasses of water a day isn’t the key to good health. Also, neglecting to wear a coat on a cold day won’t make you sick. And — you might want to sit down for this — pregnancy doesn’t last nine months. Health-related myths are often repeated as fact, even though any diligent Google search will reveal the truth behind these fallacies. Here are 26 of the most common medical myths, debunked.More. Hmmm. Some women distinctly recall pregnancy lasting a year and a half. 😉 No, but seriously, while it’s good to read Read More ›

We didn’t realize it was still legal to say so. From Michael Le Page at New Scientist: Countries in the EU, including the UK, are throwing away money by subsidising the burning of wood for energy, according to an independent report. While burning some forms of wood waste can indeed reduce greenhouse gas emissions, in practice the growing use of wood energy in the EU is increasing rather than reducing emissions, the new report concludes. Overall, burning wood for energy is much worse in climate terms than burning gas or even coal, but loopholes in the way emissions are counted are concealing the damage being done. More. Report.* The Times was going on about this too: Chopping down trees and transporting Read More ›

From astrophysicist Paul Sutter at LiveScience: 1) What we now call science, philosophy and theology were all mixed up together. 2) Early (proto-)scientists made claims and arguments that would sound totally bananas today. I’ll leave Copernicus’ motivations to another article, but he did indeed publish a book in 1543 detailing his new cosmology with the sun at the center of the universe. While it did have some advantages over the en vogue geocentric model (like neatly explaining the precession of planetary orbits and requiring fewer circles-within-circles), it did have weaknesses (how, exactly, does something like the Earth move?), and the reaction among the literate community — including the Catholic clergy — was neither hostile nor supportive. At the time, the Read More ›

From Ross Pomeroy at at RealClearScience: On a recent broadcast of BBC Radio Four’s The Infinite Monkey Cage centered around science and the paranormal, Cox had this to say on the topic: “Before we ask the first question, I want to make a statement: We are not here to debate the existence of ghosts because they don’t exist.” He continued: “If we want some sort of pattern that carries information about our living cells to persist then we must specify precisely what medium carries that pattern and how it interacts with the matter particles out of which our bodies are made. We must, in other words, invent an extension to the Standard Model of Particle Physics that has escaped detection Read More ›

From Cassandra Willyard at Nature: At the time, biologists were getting excited about the epigenome — the broad array of chemical marks that decorate DNA and its protein scaffold. These marks act like a chemical notation, telling the cell which genes to express and which to keep silent. As such, the epigenome helps to explain how cells with identical DNA can develop into the multitude of specialized types that make up different tissues. The marks help cells in the heart, for example, maintain their identity and not turn into neurons or fat cells. Misplaced epigenetic marks are often found in cancerous cells. Why didn’t it happen sooner?: The governing rule of molecular biology – the central dogma – holds that Read More ›

From Adrian Barnett at New Scientist, reviewing Mark Maslin’s All this allows Maslin to buttress his central contention, that human evolution as we know it wouldn’t have occurred without the uplift of the Tibetan plateau and the formation of the Great Rift valley. These events, and the cycling between salt flats and shallow sea that mark the history of the Mediterranean, are the great drivers of human evolution – the climatic starting gun that set off the human race. Maslin also provides a fine overview of the evolution of evolutionary thinking over the past 150 years, to the point where we now see it less as an orderly march towards an inevitable Homo sapiens and more of a random stumble Read More ›