TOP 100 SCIENCE SITES
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| Hawaii's famed white sandy beaches are shrinking KAILUA, Hawaii (AP) -- Jenn Boneza remembers when the white sandy beach near the boat ramp in her hometown was wide enough for people to build sand castles.... hosted.ap.org |
Formerly conjoined twins in stable condition MELBOURNE, Australia (AP) -- An aid worker who helped bring formerly conjoined Bangladeshi twins to Australia where doctors managed to separate them spoke of her relief Wednesday over their successful surgery, as the girls remained in serious but stable condition.... hosted.ap.org |
Vital Signs: Symptoms: Infections Lead to More Deaths in I.C.U. A study involving 75 countries showed that those with infections were more likely to die in intensive care than those without infections. feeds.nytimes.com |
A look back at 2009's most striking wildlife discoveries From a new species of giant rat to ants that took over the world, 2009 was a striking year for new discoveries about wildlife. news.bbc.co.uk |
New images show evidence of lakes on Mars Nasa pictures suggest there were 12 mile-wide lakes of melted ice on the Martian equator 3bn years agoLakes of liquid water existed on Mars at a time when the planet was previously thought to be a frozen desert, new satellite images have shown.A team of British-led scientists now believes 12 mile-wide lakes of melted ice were dotted around parts of the Martian equator 3bn years ago.No one had expected to find evidence of a warm, wet climate capable of sustaining surface water on Mars during this period of the planet's history, known as the Hesperian epoch.Lakes, seas and rivers may have existed on the planet at an earlier time between 3.8 billion and four billion years ago, experts believe.But before the Hesperian Epoch the planet was assumed to have lost most of its atmosphere and turned cold and dry.The new high-definition images come from the American space agency Nasa's Mars Reconnaissance Orbiter spacecraft. The dry lakes will be good places to go to look for signs of now-extinct microbial life, say scientists.Dr Nicholas Warner, from Imperial College London, whose team analysed the images, said: "Most of the research on Mars has focused on its early history and the recent past. Scientists had largely overlooked the Hesperian Epoch as it was thought that Mars was then a frozen wasteland. Excitingly, our study now shows that this middle period in Mars' history was much more dynamic than we previously thought."The British researchers, including scientists from University College London, examined several flat-floored depressions located above Ares Vallis, a giant gorge that runs for 1,242 miles across the Martian equator.Their origin has been a puzzle, but experts had thought they were caused by the ground sinking when ice locked in the soil evaporated and vanished without first turning liquid.The new study revealed for the first time that small sinuous channels connected the depressions. Their appearance suggests they were created by lakes on higher ground bursting their banks and water draining into lower-lying lakes.MarsAstronomyNasaImperial College LondonEducationSpaceguardian.co.uk © Guardian News & Media Limited 2010 | Use of this content is subject to our Terms & Conditions | More Feeds guardian.co.uk |