How do crows develop such distinct and individual 鈥渧oices鈥�? I don鈥檛 hear this with other bird species in my garden.
Jill Colman,
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Peterborough, Cambridgeshire, UK
Why do older people seem to experience time passing more quickly?
Derek Johnson,
Moreton-in-Marsh, Gloucestershire, UK
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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