Series 5

Swimming Through Ice

Jolyon Jenkins meets the people who want to swim a mile through freezing cold water.

• 28 mins

Series 6

The Queen's Enemies

Jolyon Jenkins meets rebels not paying their tax because they think the Queen is a traitor

• 28 mins

Series 6

Hole in the Head

The people who think drilling a hole in the head can revitalise them and prevent dementia.

• 28 mins

Series 6

Free Energy

Jolyon Jenkins meets the men trying to build free energy machines in their garages.

• 28 mins

Series 6

Whistling

Jolyon Jenkins meets the people who want whistling to be taken seriously as a musical art.

• 28 mins

Digital death - what happens to your online stuff after you've gone?

Who do you want to read your old emails when you die? Are the dead entitled to privacy?

• 27 mins

Series 7

A Sense of Direction

Might humans have an inbuilt compass like homing pigeons? If so, how can we rediscover it?

• 28 mins

Series 7

Lightning before death

Can people who haven't spoken for years have lucid conversations just before they die?

• 28 mins

Series 7

Have we already found aliens?

What should scientists do if they come across possible evidence of extraterrestrial life?

• 28 mins

Series 7

Aliens are the size of polar bears (probably)

If we find other intelligent life in the universe, what should we expect it to look like?

• 28 mins

Series 8

Holy relics

You can buy a piece of the cross Jesus died on for £400. But all is not what it seems

• 28 mins

Series 8

How to memorise anything

How the world of 'memory sports' was rocked by a group of North Korean teenage girls.

• 28 mins

Series 8

The buy button

How advertisers are trying to use neuroscientific techniques to hack our brains.

• 28 mins