Coil conversion: on the energy of a compressed spring in acid
If a spring is compressed and placed in a bath of acid and then dissolves, where does the potential energy go? Readers explain
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This week鈥檚 new questions
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Could Jupiter ever ignite into a star?
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Why does my brain like fictional stories?
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This week鈥檚 new questions
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Could you change Earth鈥檚 rotation by all running at the same time?
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Swimming strokes: which is the fastest?
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This week鈥檚 new questions
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In the ink: why are blue highlighter markers less bright than others?
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Good consumers: is online shopping greener than going into town?
Are carbon emissions lower from shopping online or in town? Readers respond on this and the bigger picture
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This week鈥檚 new questions
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End of an era: how long did it take the dinosaurs to die out?
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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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