Catch up TV

CBBC

Hey You What If?

Children's programme.

Hey You What If? Episodes

Series 1: 23. You Could Teleport?

Hey You What If? - Series 1: 23. You Could Teleport?

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

29-10-2024

CBBC

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CBBC

Series 2: 21. You Built The Tallest Building On Earth

Hey You What If? - Series 2: 21. You Built The Tallest Building On Earth

So you want to build the tallest building on Earth? Ambitious but good on yer! This episode will tell you how, starting with how not to. \n\nMost tall buildings are tall and th ...

25-10-2024

CBBC

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CBBC

Series 1: 22. You Could Build A Gingerbread House?

Hey You What If? - Series 1: 22. You Could Build A Gingerbread House?

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

22-10-2024

CBBC

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CBBC

Series 2: 20. You Threw A Ball Round The World

Hey You What If? - Series 2: 20. You Threw A Ball Round The World

To throw a ball around the world, you need to start out in space, throw it ten times the speed of a bullet and make sure your ball does not explode when it hits the atmosphere.

18-10-2024

CBBC

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CBBC

Series 1: 21. You Woke Up As A Lizard Superhero?

Hey You What If? - Series 1: 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!

15-10-2024

CBBC

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CBBC

Series 2: 19. You Only Ate Burgers

Hey You What If? - Series 2: 19. You Only Ate Burgers

If everyone in the world ate nothing but cheeseburgers, we would run out of land, and even if we went meat-free, we would have to invent some crazy burgers to get the nutrients ...

11-10-2024

CBBC

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CBBC

Series 1: 20. You Try To Catch A Falling Star?

Hey You What If? - Series 1: 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!

08-10-2024

CBBC

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CBBC

Series 2: 13. You Were The Last Person On Earth

Hey You What If? - Series 2: 13. You Were The Last Person On Earth

What would the planet be like if all other humans disappeared, leaving you as the last person on earth?

06-10-2024

CBBC

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CBBC

Series 2: 18. There Were No Colours

Hey You What If? - Series 2: 18. There Were No Colours

Imagine removing all the colours one by one? It would change more than just how things look, and after taking out just three colours, we would not be able to see anything at all!

04-10-2024

CBBC

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CBBC

Series 2: 5. You Could Stop Global Warming

Hey You What If? - Series 2: 5. You Could Stop Global Warming

Imagine if we had a thermostat that could turn the world temperature down - could we fix global warming? But be careful, a few degrees too far could cause an ice age.

04-10-2024

CBBC

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CBBC

Series 2: 4. You Needed Two Of You

Hey You What If? - Series 2: 4. You Needed Two Of You

From cloning to 3D printing, what if we could actually make copies of ourselves?

03-10-2024

CBBC

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CBBC

Series 2: 3. We Got Rid Of Bugs

Hey You What If? - Series 2: 3. We Got Rid Of Bugs

Bugs might be annoying, but we would soon regret it if we got rid of them - all our favourite foods would disappear, and there would be dung everywhere!

02-10-2024

CBBC

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CBBC

Series 2: 2. You Walked Through Walls

Hey You What If? - Series 2: 2. You Walked Through Walls

Wouldn't it be cool to be able to walk through walls? From turning into a gas to quantum trickery, we discover why it wouldn't be quite as useful as you'd like.

01-10-2024

CBBC

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CBBC

Series 2: 1. You Built A Mega Slide

Hey You What If? - Series 2: 1. You Built A Mega Slide

Could you build a slide to the other side of the world? You would need to start in space, use the slippiest slide ever and make sure you have enough supplies before you go down it!

30-09-2024

CBBC

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CBBC

Series 2: 12. You Walked On Ceilings

Hey You What If? - Series 2: 12. You Walked On Ceilings

We try using a gravity-bending black hole and spinning the earth faster to see if we can make it possible to walk on the ceiling..

29-09-2024

CBBC

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CBBC

Series 2: 17. You Flew Like A Superhero

Hey You What If? - Series 2: 17. You Flew Like A Superhero

Flying like a superhero may sound like enormous fun, but there are some serious downsides that Hollywood does not tell you about - weather, extreme cold and even fizzy blood.

27-09-2024

CBBC

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CBBC

Series 2: 11. Animals Were Supersized

Hey You What If? - Series 2: 11. Animals Were Supersized

We look at whether some animals can get gigantic and find out that if you are being chased by a giant snail or a humungous butterfly, then fear not, you must be dreaming.

22-09-2024

CBBC

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CBBC

Series 2: 10. Your Mind Could Move Things

Hey You What If? - Series 2: 10. Your Mind Could Move Things

We imagine a world where it's possible to move things with your mind like films, but find that the laws of physics mean that this superpower wouldn't quite work like you'd expect.

13-09-2024

CBBC

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CBBC

Series 2: 9. We Had Two Suns

Hey You What If? - Series 2: 9. We Had Two Suns

There is a way that Earth could have a second sun, so we try it out to see what happens.

12-09-2024

CBBC

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CBBC

Series 2: 8. You Were Invisible

Hey You What If? - Series 2: 8. You Were Invisible

We try out three potential ways to become invisible and discover some surprising side effects.

11-09-2024

CBBC

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CBBC

Series 2: 7. You Could Shout Round The World

Hey You What If? - Series 2: 7. You Could Shout Round The World

Find out how to shout from one side of the world to the other.

10-09-2024

CBBC

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CBBC

Series 2: 6. You Lived On Venus

Hey You What If? - Series 2: 6. You Lived On Venus

Venus has acid rain, crushing pressure, and is hotter than an oven, so it might not sound like the ideal place to live. However, up in the clouds it's almost just like home.

09-09-2024

CBBC

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CBBC

Series 2: 16. Money Grew On Trees

Hey You What If? - Series 2: 16. Money Grew On Trees

If you had a tree that could grow money, would that make you rich? Even if you wait 20 years for your tree to grow, you will probably end up no richer than you started.

04-09-2024

CBBC

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CBBC

Series 2: 15. You Shrunk The Earth

Hey You What If? - Series 2: 15. You Shrunk The Earth

We find out what would happen if you shrank the earth. You could jump higher and move faster, but you would end up with altitude sickness even at sea level.

02-09-2024

CBBC

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CBBC

Series 2: 14. You Built A Giant Sandcastle

Hey You What If? - Series 2: 14. You Built A Giant Sandcastle

Is it possible to build a sand castle the size of a real castle? We imagine how it could be done, using a pneumatic drill and a huge, solid gold steamroller!

30-08-2024

CBBC

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CBBC

Series 2: 24. You Surfed Without Water

Hey You What If? - Series 2: 24. You Surfed Without Water

If the beach is too far to go but you still want to spend some time surfing waves, then why not surf on land instead? Well, there are some very good reasons people don’t s ...

11-08-2024

CBBC

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CBBC

Series 2: 23. You Were Indestructible

Hey You What If? - Series 2: 23. You Were Indestructible

On the face of it, humans are a bit breakable. We have these hard skeletons that can crack if you have a tumble. But if we were indestructible, like a superhero, then we&rsquo ...

04-08-2024

CBBC

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CBBC

Series 1: 14. You Could Live On The Moon?

Hey You What If? - Series 1: 14. You Could Live On The Moon?

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

01-08-2024

CBBC

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CBBC

Series 1: 4. You Could Turn Into A Giant?

Hey You What If? - Series 1: 4. You Could Turn Into A Giant?

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

05-07-2024

CBBC

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CBBC

Series 1: 3. You Could Take A Lift To Space?

Hey You What If? - Series 1: 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?

03-07-2024

CBBC

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CBBC

Series 1: 2. You Could Dig Through The Earth?

Hey You What If? - Series 1: 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?

02-07-2024

CBBC

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CBBC

Series 1: 1. You Fell Into A Black Hole?

Hey You What If? - Series 1: 1. You Fell Into A Black Hole?

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

01-07-2024

CBBC

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CBBC

Series 2: 26. You Could Walk Up Walls

Hey You What If? - Series 2: 26. You Could Walk Up Walls

We take inspiration from the natural world as we imagine a new kind of superhero that can walk up walls.

15-03-2024

CBBC

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CBBC

Series 1: 5. You Could Go On Holiday To Mars?

Hey You What If? - Series 1: 5. You Could Go On Holiday To Mars?

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

02-02-2024

CBBC

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CBBC

Series 1: 10. The Earth Was Flat?

Hey You What If? - Series 1: 10. The Earth Was Flat?

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

22-12-2023

CBBC

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CBBC

Series 1: 9. The Moon Was Made Of Cheese?

Hey You What If? - Series 1: 9. The Moon Was Made Of Cheese?

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

21-12-2023

CBBC

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CBBC

Series 1: 8. The Earth Stopped Spinning?

Hey You What If? - Series 1: 8. The Earth Stopped Spinning?

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

20-12-2023

CBBC

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CBBC

Series 1: 7. Clouds Were Made Out Of Cotton Wool?

Hey You What If? - Series 1: 7. Clouds Were Made Out Of Cotton Wool?

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

19-12-2023

CBBC

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CBBC

Series 1: 6. You Could Levitate?

Hey You What If? - Series 1: 6. You Could Levitate?

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

18-12-2023

CBBC

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CBBC

Series 1: 24. You Took All The Water Out Of The Sea?

Hey You What If? - Series 1: 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.

10-11-2023

CBBC

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CBBC

Series 1: 19. You Could Run At The Speed Of Sound?

Hey You What If? - Series 1: 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.

03-11-2023

CBBC

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CBBC

Series 1: 18. The Earth Was Shaped Like A Doughnut?

Hey You What If? - Series 1: 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!

02-11-2023

CBBC

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CBBC

Series 1: 17. You Could Live In Slow Motion?

Hey You What If? - Series 1: 17. You Could Live In Slow Motion?

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

01-11-2023

CBBC

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CBBC

Series 1: 16. You Could Actually Reach For The Stars?

Hey You What If? - Series 1: 16. You Could Actually Reach For The Stars?

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

31-10-2023

CBBC

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CBBC

Series 1: 15. Everything You Touched Turned To Gold?

Hey You What If? - Series 1: 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.

30-10-2023

CBBC

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CBBC

Series 1: 13. You Could Shrink Yourself?

Hey You What If? - Series 1: 13. You Could Shrink Yourself?

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

26-10-2023

CBBC

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CBBC

Series 1: 12. You Can't Wait For Christmas?

Hey You What If? - Series 1: 12. You Can't Wait For Christmas?

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

25-10-2023

CBBC

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CBBC

Series 1: 11. We Could Actually Stop Climate Change?

Hey You What If? - Series 1: 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.

24-10-2023

CBBC

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CBBC

Series 2: 25. Earth Ran Out Of Energy

Hey You What If? - Series 2: 25. Earth Ran Out Of Energy

We try out a crazy idea from science fiction to build a giant sphere around the sun and give us more energy than we'll ever need.

06-10-2023

CBBC

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CBBC

Series 2: 22. You Had Kangaroo Legs

Hey You What If? - Series 2: 22. You Had Kangaroo Legs

Running a marathon is hard. At least it is for a human. But what if we could swap our legs with an animal – would that make it any easier? \n\nFirst, we try ...

03-10-2023

CBBC

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CBBC

Series 1: 26. You Could Fly Like A Bird?

Hey You What If? - Series 1: 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!

14-06-2022

CBBC

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CBBC

Series 1: 25. You Could Switch Off The Sun?

Hey You What If? - Series 1: 25. You Could Switch Off The Sun?

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

13-06-2022

CBBC

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CBBC

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