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If a northern hemisphere 鈥渋ce age鈥� is triggered, say due to the Gulf Stream failing, is it inevitable in the southern hemisphere too?

Jane MacDonald,

Hobart, Tasmania, Australia

Are gnats attracted to eyeballs, or are those near our eyes simply the ones we notice most?

Helen Haller,

Pittsford, New York, US

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

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