Colosseum: Roman Death Trap
Watch a team re-create a lifting machine and trap-door system to release a wolf into the Colosseum.
Sinkholes: Buried Alive
Sinkholes are examined. The collapses can be gradual.
Sunken Ship Rescue
Follow the epic operation to secure, raise, and salvage the Costa Concordia cruise ship
Big Bang Machine
Watch as CERN scientists prepare to restart the history-making Large Hadron Collider.
Exclusive: Edward Snowden on Cyber Attacks
The former NSA contractor sat down with NOVA to discuss the future of cyber warfare.
Rise of the Drones
The technologies behind drone aircraft are investigated.
1/30/15 2:00 PM
1/31/15 12:00 PM
2/1/15 1:00 AM
2/1/15 4:00 AM
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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?
In search of answers, Brian Greene takes us on the ultimate time-traveling adventure, hurtling 50 years into the future before stepping into a wormhole to travel back to the past. Along the way, he will reveal a new way of thinking about time in which moments past, present, and future—from the reign of T. rex to the birth of your great-great-grandchildren—exist all at once.
This journey will bring us all the way back to the Big Bang, where physicists think the ultimate secrets of time may be hidden. You'll never look at your wristwatch the same way again.
From The World's Science podcast to Nova, we'll deliver updates from these cutting edge programs. See a sample »