What would happen to our planet if the sun suddenly disappeared?
Our readers explore what might happen to Earth if the sun vanished, from dramatic shifts in gravity to the complete loss of light for photosynthesis
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Is there an advantage to insects of their bites making us itch?
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What are the origins of the yoghurt-making bacteria in milk?
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This week鈥檚 new questions
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How fast should I cycle to avoid punctures?
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If sitting cross-legged is bad for us, why is it so comfortable?
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Is there any harm in drinking too much tea? Part 2
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This week鈥檚 new questions
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Why do we experience music that is out of tune as unpleasant?
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Is toothpaste essential? Aside from fluoride, what is its value?
Readers disagree about whether teeth-clearing is all down to the brush, or whether toothpaste has all sorts of benefits.
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Would taller people benefit from bicycles with larger wheels? (part 2)
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This week鈥檚 new questions
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Does the expansion of the universe apply to atoms and objects like me?
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Could polar bears be established in the Antarctic to save the species?
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