Are we conscious when we are asleep?
It depends how we define consciousness, say our readers, who contrast the state of being asleep with the drug-induced coma of anaesthesia
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Could we build a habitable dome on the surface of Venus? (continued)
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This week鈥檚 new questions
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When was it first realised that moonlight must be reflected sunlight?
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Would a northern hemisphere 鈥渋ce age鈥� trigger one in the south too?
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How do dogs recognise that another animal is also a dog? (continued)
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This week鈥檚 new questions
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What would happen to a galaxy if the black hole at its centre left?
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Why did a piece of pink geranium make red flowers after breaking off?
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Given the impact of cats, why don鈥檛 we domesticate more rats? (Part 2)
If we are going to give up cats, then we should give up dogs too, says one reader, as research shows how much they also affect their environments
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Which is more efficient when cooling a car, A/C or windows? (Part 2)
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This week鈥檚 new questions
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Would it be theoretically possible to build a habitable dome on Venus?
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Why does a ‘square’ coin sliding down a slope soon fall over?
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