March 16, 2007 |
The ice at Mars' south pole contains enough water to cover the planet in an ocean 36 feet deep, scientists said today. Observations by the European Space Agency's Mars Express orbiter determined the ice -- largely covered by dust and rock -- is more than two miles thick in places and is nearly pure water, according to research being published in the journal Science.
March 2, 2007 |
A vast undersea wedge of gravel and grit holds the ice streams of West Antarctica in place like a doorstop, even as rising seas caused by global warming threaten to undermine them, researchers at Pennsylvania State University said Thursday. The discovery may give the world a bit of breathing room. West Antarctica encompasses enough frozen fresh water -- 7 million cubic miles -- to raise sea levels worldwide 16 feet if its ice sheet disintegrates.
November 29, 2006 |
The journal Science must intensify its screening process to weed out fraudulent studies, an independent panel said Tuesday after investigating how the prestigious journal published two high-profile stem cell studies that turned out to be bogus. The report recommended that Science establish a system to red-flag studies that claim major breakthroughs in high-visibility fields -- such as climate change and human health -- that could influence public policy.
January 14, 2006 |
Science, the journal that published two now-discredited studies about embryonic stem cells by South Korean scientist Hwang Woo Suk, formally retracted them Thursday. Hwang won global acclaim in 2004 when he reported he had used cloning technology to create human embryos, and then mined them for valuable embryonic stem cells. He reported last year that he had taken this a step further, creating several tailored batches, or lines, of stem cells from diseased and injured volunteers.
December 31, 2005 |
The journal that published a landmark paper on tailor-made embryonic stem cells -- a study since debunked as a fabrication -- said this week it would retract the article. An expert panel in South Korea said Thursday that Hwang Woo Suk and his team provided no data to prove that they had made the stem cells, as they claimed in an article published in Science.
May 13, 2005 |
When humans first left Africa, which way did they go? For many years, experts assumed these early migrants headed through what is now Egypt, across the Sinai and into the Middle East. But new evidence suggests they may have taken a more southerly route, along the coasts of the Arabian peninsula into India, Indonesia and Australia. Two reports in today's issue of the journal Science raise the possibility of the coastal route.