http://www.nytimes.com/2007/04/03/science/03time.html?ex=1333425600&en=c983aa1f96b5a3c5&ei=5124&partner=permalink&exprod=permalink
Several experiments are described. Notice how difficult it was to design experiments to test the hypothesis and how the experimental results are interpreted to support the hypotheses.
Wednesday, April 4, 2007
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