1. The Tale of a Tooth

When Englishman William Buckland found a large tooth in 1824, scientists began to unravel the mystery a world no one knew existed.

2. Tale of a Bone

Cronkite heads to Montana, Wyoming and Utah, where dinosaur bones were discovered in the 1870s.

4. Tale of a Feather

The story of an unusual dinosaur with feathers found in Germany in 1861.