Word: barriers
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...chimps is about 1.2 million years more recent than any other chromosome, Reich added. When humans and chimpanzees diverged into distinct evolutionary branches, the two species hardly had the cleanest of break-ups. So far, scientists have believed that “speciation” occurs when an isolation barrier such as a geographic impediment divides a population and mating stops, Reich said. However, that theory is not applicable to the drawn-out separation of humans and chimps discovered by the researchers, according to Reich. Reich said he hopes to conduct further research looking into the question of whether speciation...
...debate over whether to install a barrier on San Francisco's Golden Gate Bridge, the world's most popular place for suicides, is an abstraction for most people. But it is all too real for Kevin Hines. Of the more than 1,200 people who have jumped off the bridge, Hines is one of only 26 to have plummeted the 220 ft. into San Francisco Bay, hit the water at 75 mph and somehow survived. As soon as his hands left the bridge's railing, he says he thought, "I don't want...
...Debate has raged for more than 30 years over the cost, esthetics and effectiveness of installing a barrier on the Golden Gate Bridge, with various proposals made and rejected going as far back as 1970. But momentum has built in the last year, fueled in part by a documentary by filmmaker Eric Steel, who trained his cameras on the bridge for most of the daylight hours in 2004 - not to chronicle a day in the life of the bridge, as he had originally told officials, but to make a film about suicide...
...observing satellites have been training their cameras on the Gulf of Mexico and beaming what they see back home. Researchers at Louisiana State University in Baton Rouge began studying the first portfolio of pictures taken since the hurricane hit last week, and what they saw was a shock. Entire barrier islands are missing. Coastal marshes have been shredded. A Native American encampment to the south of Port Sulphur seems to have vanished. Everywhere, dark watery splotches appear in the spots where the overloaded levees failed and burst...
...addition to allowing the unreplenished coastal marshlands to sink, that tampering eventually kills the wetlands that do survive, as salt water intrudes deeper and deeper inland, killing vegetation that helps hold the soil together. The elimination of natural flooding also causes barrier islands, which line the Gulf and protect the coast, to shrink. The Mississippi in its naturally flowing state spilled silt into an intricate delta, spreading sediment east and west and fortifying the islands. Walled and dredged all the way to the Gulf, the river now dumps that silt right over the edge of the continental shelf. Geologists report...