How do dogs recognise that another animal is also a dog when there is such a vast array of canine shapes and sizes?
Justin Baker,
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Melbourne, Australia
Why can鈥檛 we conjure up smell and touch in our heads, but we can 鈥渓isten鈥� to music when nothing is coming through our ears?
John Howes,
Cardiff, UK
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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