Burning hot: Are all flames the same temperature?
Readers explain what factors affect the heat and colour of a flame and the chemical processes involved
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Dead before his time: a question about time travel
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This week’s 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’s 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
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This week’s new question
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Can you make a screen adjust for those who are short-sighted?
It would be great not to have to put on glasses to view the TV, so is it possible to adjust the screen to do this? Readers respond
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Strangers in dreams: are they real people or inventions?
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This week’s new questions
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Nettle effect: Why don’t dogs seem affected by stinging nettles?
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Hourglass figure: Why do wasps have such narrow waists?
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