From J. Dalmon
You describe a cooling glove that stops athletes “hitting the wall” (26 October, p 22).
Seventy years ago, when I was a pupil at junior school, we had a tendency to rush around the playground on hot sunny days until we became too hot and our energy would flag. But it was common knowledge that we could cool off rapidly by running water from a cold tap over the inside of the wrists – where the blood vessels are near the surface – and quickly regain our energy for more running around.
Sometimes it seems like there is nothing new under the sun!
Leatherhead, Surrey, UK
