Comets carrying chemicals necessary for life may have come to Earth billions of years ago.

Gripping personal stories from Japan offer lessons on how to act in the face of a life-threatening disaster. Airs September 28, 2011 on PBS.

Designing and building One World Trade Center and the National September 11 Memorial & Museum Premiering September 7, 2011 at 9pm on PBS

In its worst crisis since World War II, Japan faces disaster on an epic scale: a death toll likely in the tens of thousands, massive destruction of homes and businesses, shortages of water and power, and the specter of nuclear meltdown. With exclusive footage, NOVA captures the human drama and offers a clear-headed investigation of what triggered the earthquake, tsunami, and nuclear crisis.

Are we finally on the brink of a clean energy revolution? Airs April 20, 2011 on PBS

Find out how an airliner with elaborate safety and navigation features and a faultless safety record could simply vanish. 6/13/2012

Vision as we know it remains elusive for machines. But as this video short shows, they are starting to get the picture.

Jeopardy! challenges even the best human minds. Can a computer win the game?

Investigate the world of artificial intelligence and the IBM supercomputer named "Watson." 5/2/2012

Explore a new generation of ingenious materials, from clothes that monitor your mood to real-life invisibility cloaks. 8/28/2013

Can innovative materials help solve the energy crisis and lead to a sustainable future? David Pogue investigates.

Future technologies will depend on tiny stuff -- from new kinds of silicon chips to micro-robots that probe the human body. 8/21/2013

David Pogue tests his mettle against the world's strongest stuff, from steel and Kevlar to bioengineered silk. 8/21/2013

Technology reporter David Pogue hosts a 4-part special series exploring the materials that will shape our future. Wednesdays starting January 19, 2011

In 2010, several epic earthquakes delivered one of the worst annual death tolls ever recorded. The deadliest strike, in Haiti, killed more than 200,000 people and reduced homes, hospitals, schools, and the presidential palace to rubble. In exclusive coverage, a NOVA camera crew follows a team of U.S. geologists as they enter Haiti in the immediate aftermath of the tragedy.

Is Antarctica headed for a catastrophic meltdown? New evidence of ancient climate change may hold clues.

David Pogue visits DuPont to get a closer look at fireproof clothing.

They've transformed our cities and our lives, but how safe are they?

This film chronicles the fate of the 33 miners trapped in a collapsed Chilean gold and copper mine in August 2010 and investigates the many challenges faced by both the miners and those working around the clock to bring them safely to the surface. NOVA was on-site at the San José mine in Chile by early September.

Learn how medieval builders raised Gothic cathedrals to such spectacular heights.