How Climate Has Shifted Over Millions of Years

Season 47 Episode 1

About the Episode

A lake in the Arctic has a lot to say about our planet's fluctuating temperatures over the last 34 million years. Play NOVA's Polar Lab to see how.

Aired: | Expires: | Runtime: 2m 44s

Area 51: UFO Sightings and an Infamous Government Cover-Up

Area 51’s UFO myths became a cover for secret testing of cutting-edge military technology.

2:35
Is the Government Hiding Information on UFOs?

What does the government know about UFOs? Experts weigh in on the need to identify these objects.

1:03
The Physics of Breaking, a New Olympic Sport

Here are three moves in breaking, the newest Olympic sport, that appear to defy the laws of physics.

1:19
Who is the Mystery Man Buried Under Notre Dame?

Can scientists identify the man buried inside a mysterious coffin found under Notre Dame?

3:00
Dino Birds Preview

Fossils reveal how birds survived the killer asteroid and became today’s only living dinosaurs.

0:29
Extreme Airport Engineering Preview

Follow the race to build a world-class airport on the site of one of America’s busiest flying hubs.

0:30
What Are UFOs? Preview

Can science reveal the secrets of mysterious objects seen in our skies?

0:30
How Atomic Clocks Keep Perfect Time

Atomic clocks use quantum physics and the resonant frequency of atoms, like cesium, to define time.

2:15
The Most Baffling Idea in Physics, Explained

Quantum entanglement defies our everyday understanding of reality.

3:33
What Happens to Your Body During a Speed Eating Competition?

Competitive eaters stretch their stomachs beyond limits. Here’s what happens inside their bodies.

5:16

What matters to you.