New data from the Mississippi riverbed are used to
understand how and why earthquakes strike in the heartland;
the crucial role sleep plays in strengthening memories
and facilitating learning is explored; marine geologist
Sang-Mook Lee is profiled; paleontologist Jonathan Bloch is
interviewed. He thinks tiny bones embedded in limestone may
be the evolutionary evidence of the creatures that evolved
into primates. Astrophysicist Neil deGrasse Tyson hosts.
http://www.pbs.org/wgbh/nova/sciencenow/
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