Secrets of the Penguins cinematographer, Bertie Gregory, shares the memorable moment he filmed baby penguins leaping from a 50-foot cliff with PEOPLE.

This advertisement has not loaded yet, but your article continues below. NAPLES, Fla. — Andre Agassi collected two of his eight Grand Slam tennis titles at the U.S. Open and now he’ll be ...

Explorer Bertie Gregory invites viewers behind the scenes of his two-year Antarctica trip. National Geographic invites ...