Season 2, Episode 4 Nova scienceNow
First Aired: July 24, 2007
How environment may influence DNA; 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: January 25, 2005
- Rating: TV-PG
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- Premise: A newsmagazine that explores science-related matters. (more)