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T-Rex Blood? - Preserved soft tissue, including possible blood vessels and red blood cells, are turning up in dinosaur fossils.
Epigenetics - Our lifestyles can change the way our genes are expressed, leading even identical twins to become distinct as they age.
Kryptos - A coded sculpture at CIA headquarters has yet to be fully broken.
Profile: Arlie Petters - A boy from a rural village in Belize grows up to become a world-class mathematician and cosmologist.
First Air Date : Jan 25, 2005
Last Air date : Nov 14, 2012
Episode : 40 Episode
Season : 6 Season
Runtime: 55:60 minutes
Studio: PBS
Country: United States of America
