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Why do we say 鈥渁ww鈥� when we see small, fluffy things?

Charles Joynson,

Rayleigh, Essex, UK

Which bicycle lights are safest and give the best visibility: pulsating, a fixed beam front and back light, or some other method, such as helmet or backpack lights?

Naomi Stanford,

London, UK

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

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