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

Watch as NOVA pieces together clues about a volcanic cataclysm and probes questions about human evolution and Earth's fragile ecosystems. 12/14/2011

"The Fabric of the Cosmos," a four-hour series based on the book by renowned physicist and author Brian Greene, takes us to the frontiers of physics to see how scientists are piecing together the most complete picture yet of space, time, and the universe. With each step, audiences will discover that just beneath the surface of our everyday experience lies a world we'd hardly recognize.

He's been dead for more than 5,000 years and poked, prodded, and probed by scientists for the last 20. Yet í–tzi the Iceman, the famous mummified corpse pulled from a glacier in the Italian Alps, continues to keep many secrets. Now, through an autopsy like none other, scientists will attempt to unravel mysteries about this ancient mummy.

Learn how Peter Higgs' ideas about matter transformed our understanding of space.

Join Brian Greene on a wild ride into the weird realm of quantum physics, which governs the universe on the tiniest of scales. Greene brings quantum mechanics to life in a nightclub like no other, where objects pop in and out of existence, and things over here can affect others over there, instantaneously and without anything crossing the space between them.

Hard as it is to swallow, cutting-edge theories are suggesting that our universe may not be the only universe. Instead, it may be just one of an infinite number of universes that make up the "multiverse." In this show, Brian Greene takes us on a tour of this brave new theory at the frontier of physics, showing what some of these alternate realities might be like.

It separates you from me, one galaxy from the next, and atoms from one another. It is everywhere in the universe. But to most of us, space is nothing, an empty void. Well, it turns out space is not what it seems. From the passenger seat of a New York cab driving near the speed of light, to a pool hall where billiard tables do fantastical things, Brian Greene reveals space as a dynamic fabric.

Time. We waste it, save it, kill it, make it. The world runs on it. Yet ask physicists what time actually is, and the answer might shock you: They have no idea. Even more surprising, the deep sense we have of time passing from present to past may be nothing more than an illusion. How can our understanding of something so familiar be so wrong?

Take a spectacular trip to distant realms of our solar system to discover where secret forms of life may lie hidden. Combining the latest telescope images with dazzling animation, this program immerses audiences in the sights and sounds of alien worlds, while top astrobiologists explain how these places are changing how we think about the potential for life in our solar system.

Scientists want to know if methane gas on Mars is a product of biological processes or a result of geologic activity. To find out, NASA is sending a robotic rover called Curiosity to Mars. This video clip from NOVA's program Finding Life Beyond Earth explores the questions that drive the scientists and the implications of possible findings.

Learn how to find signs of extraterrestrial life in our galaxy without leaving home.

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

At PBS' recent Annual Meeting, physicist and acclaimed author Brian Greene discusses his return to NOVA with "The Fabric of the Cosmos," coming to PBS Wednesdays, November 2-23, 2011, at 9:00 p.m. ET. The four-part miniseries takes us to the frontiers of physics to see how scientists are piecing together the most complete picture yet of space, time, and the universe.

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

See why an explosion three miles above Earth would act like a hot tornado on the surface.

See neuroscientist Oliver Sacks's brain respond differently to music by Bach & Beethoven.

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

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