This week鈥檚 new questions
What is the minimum population needed to sustain a comfortable lifestyle? And why hasn鈥檛 time been decimalised?
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How far can you go before the sun no longer appears the shiniest star?
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Why do people鈥檚 hands shake when they are nervous?
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In fizzy drinks, why do only larger bubbles oscillate as they rise?
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This week鈥檚 new questions
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What causes ice spikes to form in frozen puddles or bowls of water?
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Do other animals have fingerprints? And what purpose do they serve?
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This week鈥檚 new questions
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How long is 鈥榥ow鈥�, the gap between the past and future? (continued)
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What is the evolutionary advantage of birds鈥� ability to mimic sounds?
Many birds can remember and mimic sequences of sounds they hear, including human speech, but what benefits does this skill give them? Lyrebirds and drongos could provde the answers, according to one reader
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What is the smallest animal with eyes and could it see a molecule? (continued)
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This week鈥檚 new questions
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How does our brain stop us falling out of bed while asleep?
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Does long and short-sightedness affect other animals? If so, how do they cope?
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