Hey You! What If... Season 1, Episode 19: You Could Run at the Speed of Sound?

1

You Fell Into a Black Hole?

Experience the most extraordinary ride in the universe – falling into a black hole.

5 min

2

You Could Dig Through the Earth?

The deepest hole humankind ever dug only got one thousandth of the way through the earth. But what would happen if you kept digging?

5 min

3

You Could Take a Lift to Space?

What would happen if there really was a lift that took you all the way up to space?

5 min

4

You Could Turn into a Giant?

Find out why turning into a huge giant would be no fairy tale.

5 min

5

You Could Go on Holiday to Mars?

Experience the ultimate in long-distance travel - a holiday on Mars!

5 min

6

You Could Levitate?

Good news - it’s possible to levitate! Bad news – there are some serious side effects.

5 min

7

Clouds Were Made Out of Cotton Wool?

Clouds might look like cotton wool, but if they were, things would get very messy.

5 min

8

The Earth Stopped Spinning?

Find out why stopping the Earth from spinning isn’t such a good idea.

5 min

9

The Moon Was Made of Cheese?

Things don’t quite go to plan when the moon turns into cheese.

5 min

10

The Earth Was Flat?

Find out why a flat Earth would feel very unflat indeed!

5 min

11

We Could Actually Stop Climate Change?

The planet is being destroyed - but this episode demonstrates the things you can do to help save it.

5 min

12

You Can't Wait for Christmas?

It really is possible to time travel into the future, and the team show you how!

5 min

13

You Could Shrink Yourself?

If you have always wanted to shrink yourself, this is the episode for you!

5 min

14

You Could Live on the Moon?

Some day people will live on the moon – find out just what they are in for.

5 min

15

Everything You Touched Turned to Gold?

What if you could turn things to gold? This episode shows that it might not work out that well.

5 min

16

You Could Actually Reach for the Stars?

Want to reach for the stars? It would be the journey of a lifetime - literally.

5 min

17

You Could Live in Slow Motion?

Find out why living in slow motion would let you see things no-one else can!

5 min

18

The Earth Was Shaped Like a Doughnut?

Would it be possible to live on an Earth shaped like a doughnut? You might be surprised!

5 min

19

You Could Run at the Speed of Sound?

A fun run goes wrong when one ambitious runner tries running at the speed of sound.

5 min

20

You Try to Catch a Falling Star?

What happens if you try to catch a falling star? Spoiler alert - probably best not to try!

5 min

21

You Woke Up as a Lizard Superhero?

Why waking up with lizard powers would make you useless on earth but a superhero in space!

5 min

22

You Could Build a Gingerbread House?

It’s the ultimate baking challenge: making a gingerbread house you could actually live in.

5 min

23

You Could Teleport?

Is it really possible to teleport? Spoiler alert: it could end in disaster!

5 min

24

You Took All the Water Out of the Sea?

Empty the oceans and you’d see hidden wonders, but you’d also cause the end of the world.

5 min

25

You Could Switch Off the Sun?

See what would happen if you really could switch off the sun.

5 min

26

You Could Fly Like a Bird?

Anyone can fly like a bird – you just have to travel across the solar system to do it!

5 min