Eternal Calcium The calcium in your bones is older than the earth itself, and its origins may surprise you.
Tiny Titan A new discovery points to a different upbringing for some of the biggest dinosaur species.
CSI Pliocene: Lucy Modern forensics provide clues about our ancestors' perilous lives 3 million years ago.
Great Extinctions 99.9% of all species that ever lived have perished - most of them from 5 great extinction events.