Eilish McColgan of Scotland celebrates victory in the Women’s 10,000m final Ryan Browne/Shutterstock
At the recent Commonwealth Games, I was struck by how many runners with long hair had tied it in a ponytail. When fractions of a second can decide a race, surely looser hair is a drag?
Helen Read,
Farnham Common, Buckinghamshire, UK
Gregory Adams/Getty Images
What happens to a photon after it hits the retina of my eye?
Adam Eri,
Vienna, Austria
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