2. Movement

From curiosity to understanding: researchers unveil the surprising ways that infants learn how to anticipate and respond to the movements of others.

3. Senses

Several experts make sense of how babies touch, taste and see as they embark on a sensory journey that will shape the rest of their lives.

4. Relationships

A coy smile, a puppet show and a pointed finger lead to discoveries in how babies get along with others using humor, morality and shared experiences.

5. Nature and Nurture

Resolving the debate of nature versus nurture, three scientists show how genetics and environment work together as infants discover who they are.

6. Toddlers

Researchers reveal the social skills that toddlers naturally possess, abilities that ultimately separate humans from all other species.