When we make an effort, why do we screw up our faces and close our eyes? This is of no apparent help and is likely to make us more vulnerable to predators.
Dorothy Woolley
Newark on Trent, Nottinghamshire, UK
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Why don鈥檛 marine mammals like whales get 鈥渢he bends鈥�?
David Garnett
Rapid Creek, Northern Territory, Australia
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