Hey You What If?: Full TV Schedule and Live Stream For Kids
Impossible questions need epic answers! From What if the moon was made of cheese to What if all you touched turned to gold? See the world get turned upside down as we find out!
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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.
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.
24. You Surfed without Water
Sometimes you want to go surfing, but it's too far to the beach, so we try surfing on land with the help of a volcano and some giant fans.
23. You Were Indestructible
We imagine becoming unbreakable by removing our bones, turning our skin to metal and finally by becoming completely elastic, but indestructibility isn't everything we hoped for.
22. You Had Kangaroo Legs
To win a marathon, are you better off with the bouncing legs of a kangaroo, the long legs of a T rex or sticking with the legs of a human?
21. You Built the Tallest Building on Earth
We reveal how to create the ultimate in tall buildings by going to the moon and taking inspiration from wedding cakes.
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.
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 we need.
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!
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.
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.
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.
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!
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?
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..
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.
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.
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.
8. You Were Invisible
We try out three potential ways to become invisible and discover some surprising side effects.
7. You Could Shout Round the World
Find out how to shout from one side of the world to the other.
Hey You What If? FAQs
When is Hey You What If? next on?
The next broadcast of Hey You What If? airs at Mon 20 Apr · 09:55(UK: Mon 20 Apr · 09:55) on CBBC.
Which channel is Hey You What If? next on?
Hey You What If? returns on CBBC next. Check the listings above for every upcoming airing.
When will Hey You What If? be available on iPlayer?
Episodes land on BBC iPlayer just after the show finishes airing. Use the streaming section above to jump in as soon as it drops.