Number games: how to choose a PIN
Does it matter if your PIN is randomly generated or a memorable number like your birthday? Readers respond
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This week’s new questions: all about mulberries
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Burning hot: Are all flames the same temperature?
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Dead before his time: a question about time travel
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This week鈥檚 new questions
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Playing dirty: Which sport has the highest emissions?
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Web sense: How do spiders move around their webs?
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This week鈥檚 new questions
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Shrinking gravity: why doesn’t gravity diminish over time?
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Super seers: why some people can see ultraviolet light
It turns out that some people can see ultraviolet light. Readers explain how this can happen
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This week鈥檚 new question
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Can you make a screen adjust for those who are short-sighted?
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Strangers in dreams: are they real people or inventions?
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This week鈥檚 new questions
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