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Series 6

The Burning Question

What is fire? Is it a solid, liquid or a gas? Adam Rutherford and Hannah Fry investigate.

• 18 mins

Series 6

The Dark Star

The science sleuths investigate the question 'What's inside a black hole?'.

• 23 mins

Series 6

Itchy and Scratchy

Why do we itch and should we scratch?

• 21 mins

Series 6

Kate Bush's Sonic Weapon

Can sound kill? Inspired by a Kate Bush song, we ask whether sonic weapons could work.

• 21 mins

Series 7

The Curious Cake-Off

How to make the perfect sponge using the power of science.

• 19 mins

Series 7

The Polar Opposite

What would happen if the Earth's magnetic poles flipped?

• 19 mins

Series 7

The Sticky Song

Why do tunes get stuck in our heads? And what makes some songs stickier than others?

• 24 mins

Series 7

The Shocking Surprise

Why do we get static shocks? Our science sleuths try to crack another case.

• 28 mins

Series 7

Adventures in Dreamland

Why do we dream? Drs Rutherford and Fry delve into the science of sleep.

• 24 mins

Series 8

The Baffled Bat

How do bats echolocate? And why don't they get confused by neighbouring signals?

• 25 mins

Series 8

The Dreadful Vegetable

Why don't children like vegetables?

• 30 mins

Series 8

The Cosmic Speed Limit

Can anything travel faster than the speed of light? Drs Rutherford and Fry investigate.

• 22 mins

Series 8

The Curious Face Off

Are machines better than humans at identifying faces?

• 25 mins

Series 8

Goldfinger's Moon Laser

Could we shoot a laser to the moon?

• 24 mins

Series 9

The Enigma of Sex, Part 1

Why does sex exist? And why aren't we all the same sex?

• 24 mins

Series 9

The Enigma of Sex, Part 2

Why don't we have more than two sexes?

• 22 mins

Series 9

The Tiniest Dinosaur

Which is the tiniest dinosaur?

• 29 mins

Series 9

The Atomic Blade

What makes things sharp?

• 23 mins

Series 9

The Cosmic Egg

How do we measure the age of the universe?

• 30 mins

Series 10

The Fifth Dimension

Is there a fifth dimension? Hannah and Adam visit CERN to find out.

• 27 mins

Series 10

The Human Instrument

Why do our voices change as we get older?

• 27 mins

Series 10

The D茅j脿 Vu

Why do we get d茅j脿 vu?

• 25 mins

Series 10

The Lucky Number

How do I win the lottery?

• 25 mins

Series 10

The Dawn Chorus

Why do birds sing? And why are some songs so complex?

• 27 mins

Series 11

The Alien Enterprise Part 1

How do we look for alien life, and what are we expecting to find?

• 25 mins

Series 11

The Alien Enterprise Part 2

Are intelligent aliens out there?

• 24 mins

Series 11

The Running Joke

How fast can a human run?

• 38 mins

Series 11

The Random Request

Is anything really random?

• 26 mins

Series 11

A World of Pain

Why do we all have different pain thresholds?

• 33 mins

Series 12

The Viking Code

How do ancestry DNA tests work?

• 26 mins