This is an article from Curious Kids, a series for children of all ages. The Conversation is asking young people to send in questions they’d like an expert to answer. All questions are welcome. Skip to the bottom to see how to enter. How do the clouds stay up in the sky? – Samson, age four, London, UK. Thanks for the question, Samson. Believe it or not, I once weighed a cloud and not many people c
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