Season 34, Episode 21 Nova scienceNow

First Aired: July 24, 2007

A look at how environment may affect DNA, turning on and off specific genes; the “Kryptos” sculpture at CIA headquarters, which contains coded messages; homemaker-turned-paleontologist Mary Schweitzer, who discovered spongy tissue in a 68 million-year-old T. rex; Duke mathematics and physics professor Arlie Petters, who is working to prove the “braneworld” theory of gravity, which posits that there are five dimensions (four spatial, plus time).

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  • Premiered: March 3, 1974
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  • Premise: PBS's premier science-documentary series, which has won six Peabody Awards and more than 20 Emmys (four in 2002 alone) since its 1974 debut. `Nova' clearly, and often engagingly, `demystifies' a vast range of science, technology and history topics---past a… (more)

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