Paula S. Apsell

Over 60,000 years ago, the first modern humans - people physically identical to us today - left their African homeland and entered Europe, then a bleak and inhospitable continent in the grip of the Ice Age. But when they arrived, they were not alone: the stocky, powerfully built Neanderthals had already been living there for hundreds of thousands of years. So what happened when the first modern humans encountered the Neanderthals? Did they make love...

NOVA returns to Ground Zero to witness the completion of One World Trade Center. As the superstorm Sandy bore down on New York, many feared that the still-incomplete structures would be especially vulnerable to the storm's wrath. NOVA reveals the engineering story behind their remarkable resilience to nature's worst blows. The greatest test is still to come, though: will the final product be a fitting site for national remembrance?

These unmanned flying robots - some as large as jumbo jets, others as small as birds - do things straight out of science fiction that can both amaze - and horrify. Much of what it takes to get these robotic airplanes to fly, sense and kill has remained secret. But now, with unprecedented access to drone engineers (including a rare interview with the "Father of the Predator," Abe Karem) and those who fly them for the U.S. military, NOVA reveals the...