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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
Tuberculosis: The Forgotten Plague

Tuberculosis: The Forgotten Plague

Season 6 Episode 5
26:49
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Genius by Stephen Hawking

How Far Apart Are the Moon and the Earth?

The volunteers are given scale models of the moon and Earth. They must guess the distance between the two and then work out how to find out the correct answer. They use the moon in the sky to find the distance between their two models.