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Everything Under The Sun
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2. Why are rainbows so colourful? Why do we sleepwalk? Why do some people spit when they're talking?

10 min•30 november 2018

In this week's show we answer three questions from Wren, Abi and Tomos.


They would like to know why rainbows are so colourful, why some people talk in their sleep and why some people spit when they're talking? We discuss where the rainbow's colours come from and we talk about Iris, the goddess of the rainbow, and why the colours of our eyes are named after her. We discover the parts of a sleep cycle when you're most likely to sleep talk and finally what causes spitting, how to stop it from happening, as well as the amount of saliva our bodies make each day - it's a lot more than you might think!


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#175 Why do we wear red noses on Red Nose Day? With guest experts Emma Freud & Richard Curtis. Why is your elbow called a funny bone when it’s not funny? Why does bogie come out of your nose when you cry?
•13 min
#174 How does the Moon control the Earth's tides? w/ Brother Guy Consolmagno. What causes a blood moon? Why is there no air on the Moon?
•14 min
#173 Merry Christmas! Did Santa deliver presents to dinosaurs? w/ Andy Day! How do snow shoes work? Why does ice stick to things?
•10 min
#172 Where does space end? w/Jim Al-Khalili. How do ships float? What is the biggest airport in the world?
•10 min
#171 How do volcanoes erupt? w/ Robin George Andrews. How are continents made? How do we breathe in oxygen and breathe out carbon dioxide?
•13 min
#170 Who came up with the idea of Unicorns? w/ Catherine Cawthorne. Why do you see lightning before you hear thunder? When was the first LEGO built?
•12 min
#169 How are seeds made? w/ Leon Perrie. Why don't humans have fur? Why do Hippos have large teeth?
•12 min
#168 Can whales from Antarctica learn the language of whales from Iceland? w/ Tom Mustill. Why is sea water so cold? Why do you get a runny nose when you come out from the cold?
•15 min
#167 How do power stations work? w/ Kathy Joseph. How deep can whales go? How does our body produce saliva?
•13 min
#166 Can some animals talk to others? w/ Jonathan Balcombe. Why do steam trains chuff? Why are panthers black and why do they climb trees?
•11 min

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