In the high-profile civil case against Wall Street titan Steven Cohen, federal authorities accuse the hedge fund head of allowing insider trading within his ranks. Cohen's lawyers offered up a defense fit for the digital age: They claim he didn't see a key, incriminating email because he gets too many messages — an estimated 1,000 a day, and opens only 11 percent of them.
Originally published on Mon August 5, 2013 3:25 pm
This is the story of two continents doing battle, North America versus South America. It is also a biological mystery.
For a very long time, North America and South America were separate land masses. The Pacific Ocean slipped between them, flowing into the Caribbean. The Isthmus of Panama was there, but it was underwater. The two continents didn't touch.
Since the 1930s, Louisiana has lost roughly as much land as makes up the state of Delaware.
"If you put the state of Delaware between New Orleans and the ocean, we wouldn't need any levees at all," says John Barry, vice president of the Southeast Louisiana Flood Protection Authority-East. "There is this large buffer of land that has disappeared, and that buffer makes New Orleans much more vulnerable to hurricanes."
Biologists normally look for the hellbender slamander, which is known by the nickname "snot otter," under rocks in streams. But now there's a gentler way: They can take water samples and look for traces of the animals' DNA.
If you want to protect rare species, first you have to find them. In the past few years, biologists have developed a powerful new tool to do that. They've discovered that they can often find traces of animal DNA in streams, ponds — even oceans.
The idea took root just five years ago, when biologists in France found they could detect invasive American bullfrogs simply by sampling pond water and looking for an exact genetic match to the frogs' DNA.