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Former Raiders running back Rod Smart, best known for wearing an XFL jersey with “He Hate Me” on the back, was found safe in South Carolina Tuesday evening after being missing for a week, according to police.The 42-year-old Smart, whose short NFL career ended when the Raiders cut him at the end of the preseason in 2006, was located after authorities reached out to the public for assistance in finding the ex-NFL player who was last seen Wednesday in Indian Land, S.C.“It is unusual for him to …
(Visited 20 times, 1 visits today)FacebookTwitterPinterestSave分享0 A fossil soft-bodied lobopodian has been found in Carboniferous strata in Illinois.Lobopodians (“lobe-footed”) are soft-bodied worm-like animals with cylindrical legs that are well known from the Cambrian explosion. The best-known fossils were from Sweden, although members have been found in the Burgess Shale in Canada. The taxonomy of these classic Cambrian-explosion animals has been confusing; some evolutionists think they are related to modern tardigrades (water bears) or were ancestral to arthropods. Paleontologists had thought they died out in the middle Cambrian, but now, an exquisitely-preserved fossil has been found in Carboniferous rock in Illinois. This one is not related to onycophorans. Current Biology reported,1Lobopodians, a nonmonophyletic assemblage of worm-shaped soft-bodied animals most closely related to arthropods, show two major morphotypes: long-legged and short-legged forms. The morphotype with stubby, conical legs has a long evolutionary history, from the early Cambrian through the Carboniferous, including the living onychophorans and tardigrades. Species with tubular lobopods exceeding the body diameter have been reported exclusively from the Cambrian; the three-dimensionally preserved Orstenotubulus evamuellerae from the uppermost middle Cambrian “Orsten” (Sweden) is the youngest long-legged lobopodian reported thus far. Here we describe a new long-legged lobopodian, Carbotubulus waloszeki gen. et sp. nov., from Mazon Creek, Illinois, USA (∼296 million years ago). This first post-Cambrian long-legged lobopodian extends the range of this morphotype by about 200 million years. The three-dimensionally preserved specimen differs significantly from the associated short-legged form Ilyodes inopinata, of which we also present new head details. The discovery of a Carboniferous long-legged lobopodian provides a more striking example of the long-term survival of Cambrian morphotypes than, for example, the occurrence of a Burgess Shale-type biota in the Ordovician of Morocco and dampens the effect of any major extinction of taxa at the end of the middle Cambrian.This discovery, therefore reveals several problems for evolutionary theory and the geologic time scale. For one, these are delicate, soft-bodied animals that did just fine for 200 million years in evolutionary time, through all the twists and turns of fate that led to mass extinctions of other animals. For another, the exquisite preservation of the fossilized details of soft tissues challenges beliefs they lasted nearly 300 million years through many other geologic and climatic upheavals. Third, finding one of these in Illinois, when others were known from Sweden and Canada, shows a “remarkable range extension” of these small, delicate creatures that further reduces “the impact of any major turnover of taxa at the end of the middle Cambrian.” Finally, the fossil shows virtually no evolution for 200 million years: the authors said, “the morphology has not changed in any significant aspect.” If living tardigrades and velvet worms represent modern counterparts of lobopodia, then evolution within this phylum has been scant or non-existent for the whole duration of the fossil record from the lower Cambrian onward.1. Haug, Mayer, Haug, Briggs, “A Carboniferous Non-Onychophoran Lobopodian Reveals Long-Term Survival of a Cambrian Morphotype,” Current Biology, Volume 22, Issue 18, 1673-1675, 09 August 2012, doi:10.1016/j.cub.2012.06.066.Though small and delicate, lobopodians are complex organisms. They are not mere amoebas with pseudopodia; they are multicellular animals with coordinated legs, bilateral symmetry, a gut, and behavior suited for their life. Viewers of the documentary Darwin’s Dilemma may recall the strange-looking Hallucigenia, a long-legged lobopodian from the Burgess Shale. This finding adds to the challenge against Darwinism that movie so effectively made.
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One of the big surprises in Monday’s wet evening programme in track and field came when Russian Yelena Isinbayeva failed to win a historic third successive gold medal at the Olympics.Russians have dominated the specialised sport of pole vault for decades. In the past, it was the incomparable Sergei Bubka, and now it’s Isinbayeva, who left people in awe as they soared to new heights.As a result, it was unusual to see Isinbayeva clinching ‘just’ a bronze as American Jennifer Suhr won gold and Cuba’s Yarisley Silva claimed silver.But the 30-year-old was not devastated and said she was not contemplating retirement. She said the inability to run or jump for two months made her miss many competitions this year and made all the difference.”I did Sotteville and Monte Carlo but, of course, it was not enough and I was taking a risk if my injury got worse. So this bronze is like gold for me,” said the Russian.On her future plans, Isinbayeva was pretty clear she was not retiring. “Actually my plans change every day. I am like a pair of twins. Today I wake up and say, ‘I will stop’. Then the next day I say, ‘I will continue’,” she said, even discussing her plans for 2016.Explaining her feelings further, Isinbayeva said: “Over the past three years, between Beijing and London, life has not been easy for me, both physically and psychologically. I was asking myself ‘Why am I continuing? What for’,” she said.advertisementBut with coach Yevgeni Trofimov inspiring her, she decided to give the Olympics another go. “My coach said ‘let’s try again’. In Istanbul (at the 2012 world indoor championships), I won a gold medal and in Stockholm I set a world record jumping 5.01 metres. Then, unfortunately, I got injured in May and I could not train properly before London,” Isinbayeva said.Without making any excuse, the cherubic Russian told the media: “Today, my leg was not working. I had to work with my hands. Of course, today it is not a fairy tale, today competing was not easy, this is why this bronze is like gold to me.”At a time when most of the athletes are scared about the weather, Isinbayeva added how difficult it was in the middle of the Olympic Stadium. “It was terrible for me. I know the weather was so-so in England, but today it was the worst possible for women’s pole vaulting,” she said.Explaining her love affair for setting world records, the bronze medallist recalled an incident. “In Monaco, after the (Diamond League) meeting, I was sitting next to Prince Albert (of Monaco) and a man came up to me and said that I had already surpassed Sergey Bubka. He showed me a piece of paper on which he had a lost of Bubka’s records and mine. Bubka broke the world record 27 times, and I had already done it 28 times by then.”So for all those who feared that the world has seen the last of the pole vault champion, there is still hope.
© 2013 Phys.org (Phys.org) —Two planetary researches, one from Hampton University and the National Institute of Aerospace, the other from Louisiana State University, have published a paper in the journal Nature suggesting that for a period of time, the Earth was very similar to Jupiter’s moon Io—with heat from within being released through what are known as heat-pipes. The new theory by William Moore and Alexander Webb goes against the common consensus that the Earth transitioned directly from a planet with a hot molten liquid layer to one covered by tectonic plates. Credit: Nature Planetary scientists have been stumped in trying to figure out how a planet with a molten hot liquid surface could transition directly to one with tectonic plates—the only way that could happen would be if the planet cooled almost instantly. But all available evidence indicates it didn’t, so how did the tectonic plates come about? Moore and Webb suggest there was an intermediate stage—one where heat was allowed to escape from the interior of the planet through heat-pipes.In practical terms, heat pipes are soft material “holes” in a planet’s surface. Hot magma from below is pushed upwards through channels towards the surface where it flows out as lava allowing heat to escape into space. While very similar to volcanoes, they don’t necessarily erupt, they simply ooze. Jupiter’s moon Io is an excellent example of a body that oozes lava, with so many heat-pipes that its entire surface is covered by material constantly pushed up from below. The result is a constant turnover of surface material, mixing with that from below. Moore and Webb theorize that a very similar situation existed on Earth between the time the surface was hot molten liquid and the development of tectonic plates. They suggest the constant movement of material up though the heat-pipes led to a build-up on the surface. As the planet cooled over time, the material that was pushed up slowly hardened and became the tectonic plates. And because there was still a lot of heat in the core of the planet, fissures developed which caused the plates to break apart and to travel as they continue to do today.Moore and Webb point to ancient zircon and diamonds found on Earth to strengthen their theory—the rocks have been dated to the time period in question (roughly 3 to 4 billion years ago) and show the weathering that would have occurred had they been constantly churned by heat-pipe transport. More information: Heat-pipe Earth, Nature 501, 501–505 (26 September 2013) DOI: 10.1038/nature12473AbstractThe heat transport and lithospheric dynamics of early Earth are currently explained by plate tectonic and vertical tectonic models, but these do not offer a global synthesis consistent with the geologic record. Here we use numerical simulations and comparison with the geologic record to explore a heat-pipe model in which volcanism dominates surface heat transport. These simulations indicate that a cold and thick lithosphere developed as a result of frequent volcanic eruptions that advected surface materials downwards. Declining heat sources over time led to an abrupt transition to plate tectonics. Consistent with model predictions, the geologic record shows rapid volcanic resurfacing, contractional deformation, a low geothermal gradient across the bulk of the lithosphere and a rapid decrease in heat-pipe volcanism after initiation of plate tectonics. The heat-pipe Earth model therefore offers a coherent geodynamic framework in which to explore the evolution of our planet before the onset of plate tectonics. New model of Earth’s interior reveals clues to hotspot volcanoes Journal information: Nature Explore further Citation: Research duo suggest early Earth had heat-pipe channels similar to Jupiter’s moon Io (2013, September 26) retrieved 18 August 2019 from https://phys.org/news/2013-09-duo-early-earth-heat-pipe-channels.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
September 27, 2013 Enroll Now for Free Free Workshop | August 28: Get Better Engagement and Build Trust With Customers Now This month marks 15 years since the launch of Google. A company that now has a market cap of nearly $300 billion, Google first started in a garage as a research project by Stanford University students Larry Page and Sergey Brin.You’ve probably already noticed today’s Google Doodle video marking the anniversary. But in the search bar, type in “Google in 1998.” You’ll see what the search results for the name “Google” were back then. And here’s what Google’s home page looked like in 1998, courtesy of the Stanford University Internet Archive. It’s pretty neat to see how the site’s design has evolved.Related: Google It! Anatomy of a Tech Giant (Infographic) This hands-on workshop will give you the tools to authentically connect with an increasingly skeptical online audience. 1 min read