T-Rex Blood, Epigenetics, Kryptos - S3.E10 - NOVA scienceNOW

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.

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