Skip to main content

Up Next

Can We Time Travel?

Can We Time Travel?

Season 1 Episode 1
54:40
Are We Alone?

Are We Alone?

Season 1 Episode 2
54:41
Why Are We Here?

Why Are We Here?

Season 1 Episode 3
54:41
Where Did the Universe Come From?

Where Did the Universe Come From?

Season 1 Episode 4
54:41
What Are We?

What Are We?

Season 1 Episode 5
54:41
Where Are We?

Where Are We?

Season 1 Episode 6
54:11
Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
53:31
Back to Show
Genius by Stephen Hawking

Stephen Hawking’s Machine of Life

The volunteers start Stephen Hawking’s Machine of Life. The machine works by transferring an impulse from one place to another, sustained by the input of energy. Each moving part follows the laws of physics and together they keep the impulse moving.

Support Provided By
Where Are We?
Unlock with PBS Passport
54:11
Can three volunteers measure the solar system and universe to find out where we are?
What Are We?
Unlock with PBS Passport
54:41
Three volunteers set out to find an amazing realization about the nature of life itself.
Where Did the Universe Come From?
Unlock with PBS Passport
54:41
The group experiments with cars and balloons to understand the origin of the universe.
Why Are We Here?
Unlock with PBS Passport
54:41
The volunteers pose an important question about our role in the universe.
Are We Alone?
Unlock with PBS Passport
54:41
Three volunteers set to find out how likely it is that aliens exist.
Can We Time Travel?
Unlock with PBS Passport
54:40
Stephen Hawking sets three challenges to find out if we could be time travelers.
Active loading indicator