麻豆传媒

Why are human babies so reluctant to go to sleep?

John Leonard,

Canberra, Australia

I can see how different grunts could come to mean 鈥渂ear鈥�, 鈥渄eer鈥� or 鈥渞un鈥�. But how do grammatically complex languages get their cases and declensions?

Peter Borrows,

Amersham, Buckinghamshire, UK

To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.

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