Hey You! What If... S1:E5

You Fell Into a Black Hole?

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

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?

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?

You Could Turn into a Giant?

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

You Could Levitate?

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

Clouds Were Made Out of Cotton Wool?

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

The Earth Stopped Spinning?

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

The Moon Was Made of Cheese?

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

The Earth Was Flat?

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

We Could Actually Stop Climate Change?

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

You Can't Wait for Christmas?

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

You Could Shrink Yourself?

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

You Could Live on the Moon?

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

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.

You Could Actually Reach for the Stars?

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

You Could Live in Slow Motion?

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

The Earth Was Shaped Like a Doughnut?

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

You Could Run at the Speed of Sound?

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

You Try to Catch a Falling Star?

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

You Woke Up as a Lizard Superhero?

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

You Could Build a Gingerbread House?

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

You Could Teleport?

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

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.

You Could Switch Off the Sun?

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

You Could Fly Like a Bird?

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