Echo, the elephant matriarch, was the subject of many NATURE films and the leader of a carefully studied herd of elephants in Africa. Last year, she died of natural causes. NATURE looks back at this remarkable animal through extraordinary footage and interviews with the researchers that cared for and studied this amazing herd....7pm
The March 11th earthquake was the world's fourth largest earthquake since record keeping began in 1900 and the worst ever to shake Japan. The seismic shock wave released over 4,000 times the energy of the largest nuclear test ever conducted; it shifted the earth's axis by 6 inches and shortened the day by a few millionths of a second. The tsunami slammed Japan's coast with 30 feet-high waves that traveled 6 miles inland, obliterating entire towns in a matter of minutes. JAPAN'S KILLER QUAKE...8pm
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