Last Word
What would Earth be like if life had never existed?
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Last word
New Scientist's popular Last Word series gives readers the opportunity to answer each other's questions about everyday science phenomena, from the shape of scones to the evolutionary history of toenails. To answer a question or ask a new one, email lastword@newscientist.com
Last Word
This week’s new questions
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Last Word
Why do humans show their teeth to signal friendship or mirth?
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Last Word
How does a photon know to travel at the speed of light?
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Last Word
This week’s new questions
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Last Word
What is the evolutionary reason for superstitious behaviour?
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Last Word
Is the sky really clearer early in the morning? If so, why?
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Last Word
This week’s new questions
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Last Word
If the speed of light changed, how would it affect our lives?
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Last Word
What is the smallest whole number with no interesting properties?
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Last Word
This week’s new questions
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Last Word
Do all planets spin? If so, why?
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