End of an era: how long did it take the dinosaurs to die out?
After a giant asteroid struck Earth 66 million years ago, how much time elapsed before the last dinosaur died? Readers respond with a variety of perspectives
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Fresh fruit: does washing produce reduce the risk of food poisoning?
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This week鈥檚 new questions
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Freewheeling: does one finger provide significant support on a bike?
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Time and tide: what is the smallest body of water with lunar tides?
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This week鈥檚 new questions
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Clean limbs
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Still waters
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Battery power
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This week鈥檚 new questions
When you acclimatise to different weather, what goes on in your body? And why are freezer doors hard to open?
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Why does a lightning strike sizzle and power light bulbs?
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This week鈥檚 new questions
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Why do biscuits go soft and cakes go hard?
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Does a large meal make you tired, and if so, why?
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