51动漫

Last Word

What鈥檚 the minimum population needed to sustain a comfortable life?

Readers give their take on the minimum population needed to support a comfortable life for someone in the US, in terms of the people who create and maintain infrastructure, goods and services

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How do animals recognise their young and do they know they reproduce?

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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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What could happen to change gravity on Earth as we know it?

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Why do some things, like fresh coffee, smell better than they taste?

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How does porridge manage to stick to non-stick pans?

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This week鈥檚 new questions

Is it possible for a loud sound to be so brief that we can鈥檛 hear it? And where did the microbes that turn milk into yogurt come from?

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Why is traffic noise on roads louder when it is raining?

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How do spiders abseil to the floor so quickly when disturbed?

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Why can鈥檛 humans regrow limbs like an axolotl or a lizard?

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Should we engineer cats to stop their urge to kill (continued)?

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