What鈥檚 the best swimming stroke in terms of calories burned?
Will breaststroke help you lose weight more effectively than front crawl? Readers respond
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Why are animals stripy and why can’t humans have patterned hair?
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This week’s new questions
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Environment
Carbon farming scientist David Reay on repaying his emissions debt
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Environment
How climate change is hitting crab hunting in the mangroves of Brazil
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Feedback: What did big tech find when it looked inside a black hole?
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Liana Finck cartoon
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Liana Finck cartoon
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Liana Finck cartoon
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Technology
AI predicts USA are favourites to win the 2019 Women鈥檚 World Cup
A machine learning model estimates USA have a 28 per cent chance of winning the FIFA Women's World Cup 2019, followed by France on 14 per cent
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Technology
How to program a device that plays with random numbers
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What鈥檚 better for the environment, using a hand dryer or paper towels?
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What happens to the energy of a moving car when it hits a wall?
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This week’s questions
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