The notorious hacker, Marcel Lehel Lazar (also known as ``Guccifer''), who discovered Hillary Clinton's private email account; giant chimpanzees threatened by poachers; new insight into recovery from traumatic brain injuries.

Wildlife refuge Palmyra Atoll demonstrates what can happen when harmful things are removed from an environment; Americans who joined ISIS; Olympic swimmer Michael Phelps.

A lab in South Korea offers commercial dog cloning.

Althorp, the 500-year-old mansion that was Princess Diana's childhood home; Richard Engel interviews CIA Director John Brennan at Creech Air Force Base in Nevada; the story behind architectural marvel, the Bay Bridge.

Airbnb CEO Brian Chesky; driverless cars; comic Jay Leno; a revolutionary approach to treating the nation's heroin epidemic.

TV host David Letterman; efforts to resolve distrust between cops and poor urban communities in Los Angeles; Steven Francesco, whose son died from a side effect of taking antipsychotics.