Why are the gears and chain always on the right-hand side of bicycles?
Mark Holker,
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Braunton, Devon, UK
Cats, geese and snakes hiss, and angry audiences hiss to make their feelings known. How is it that this 鈥渓anguage鈥� is common to such diverse creatures, as well as to those who understand the warning?
Alan Stanton,
Birmingham, UK
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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