If time started at the big bang, is it ever likely to come to a halt?
John Howes,
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Cardiff, UK
Why do almost all vertebrates have tails, even when they don鈥檛 seem useful, but apes and frogs don鈥檛?
Will Stites,
Stevens Point, Wisconsin, US
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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