T. Rex Blood?

Preserved soft tissue, including possible blood vessels and red blood cells, are turning up in dinosaur fossils.

Inside the Bones

See what Mary Schweitzer's team found within the primordial remains of everything from a mammoth to a Triceratops.

Ask the Expert

Paleontologist Mary Schweitzer answers viewer questions about the preservation of soft tissues in ancient fossils and its implications for researchers.

Video Extra

Find out what T. rex and chickens have in common.

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© | Created July 2007