Is the second wind that long-distance runners get real or imagined? Mike Robinson/Alamy Stock Photo
Running on empty
Many runners experience a “second wind”. Is this a real, measurable phenomenon or a psychological effect? Robert Cy Jones, East Grinstead, UK
Water effect
Water usually reduces friction between two surfaces. So why is it more difficult to put on socks and gloves when your feet and hands are wet? Jim Beattie, Glasgow, UK
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