Sir, – Many thanks to William Reville for the very enlightening article "Aerobic exercise – the route to lifelong brain sharpness" (Science, March 19th).
He explained the significance of exercise and its importance in keeping the brain functioning,
After a few practices, I can stand on one leg for a few minutes, and then the other leg.
My doggy will get two walks daily from now on. – Yours, etc,
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A LYONS,
Churchtown,
Dublin 14.