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When I go walking with my wife, six of her paces are equivalent to five of mine. Does this mean she gets more exercise than me?
Derek Shotton, Havant, Hampshire, UK
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If plastic is inert, why does it have a taste and smell? Plastic bin bags have a strong smell when first opened and water left in plastic bottles can acquire a distinct taste.
Louis Chambers, London, UK
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Why do some people like gambling so much? What is the evolutionary root of this behaviour?
Sergey Kasatkin, San Francisco, California, US
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