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Astronauts have to wash their hair too! Watch as Karen Nyberg on the International Space Station shows us how. 

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What's the best thing about social media? And what's the worst? In this video, young people say whether they think social media can be bad for your health.

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Doctor Who is a popular science fiction series. In it, the Doctor travels through time and space fighting evil. Watch the exciting trailer for Series 10!

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This week Sophia is joined by a very special guest ... her mum, Kissu! Join them as they try the tongue twister challenge, then tell us in the comments who you think the winner is! 

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