Why are there no green mammals?
There are green fish, green amphibians, green reptiles and green birds. Our readers explore why evolution doesn鈥檛 seem to have produced green mammals
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Why does being out in the rain feel so unpleasant sometimes?
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This week鈥檚 new questions
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Why does anger make us stronger, yet we become weak with laughter?
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What is the smallest body of water in which tides can be detected?
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Why do some people struggle to tell right from left?
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This week鈥檚 new questions
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Why is it easier to copy a picture of an object than the real object?
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What鈥檚 the minimum population needed to sustain a comfortable life?
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How do animals recognise their young and do they know they reproduce?
More answers from readers. Recognising your offspring doesn鈥檛 mean you won鈥檛 eat them, suggests one reader. And another illustrates how a dog is never too old to be admonished by its mother
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This week鈥檚 new questions
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Why hasn鈥檛 time been decimalised?
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This week鈥檚 new questions
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I lost 15 kilograms, so why can鈥檛 I comfortably carry the same weight?
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