Last Word
Grinning is a sign of aggression in animals, so why do humans smile?
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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
What is the difference between a cake, a sponge and a biscuit?
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Last Word
Absolute zero is the lowest temperature but is there an upper limit?
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Last Word
This week’s new questions
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Last Word
Why are bird droppings white, considering all they eat? (part 2)
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Last Word
How can we know that time exists?
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Are there any evolutionary advantages of perimenopausal hot flushes?
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This week’s new questions
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Last Word
The impossibly low rainbow: The mystery continues
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Does the expansion of the universe apply to atoms and objects like me?
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Last Word
What is the best way to tie shoelaces?
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Last Word
This week’s new questions
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