The easiest way to check the temperature of the water you're about to step in is probably using a floating thermometer. You ...
New Scientist on MSN
You should turn off fans when it's too hot – but how hot is too hot?
Fans can make you hotter rather than cooler, but the temperature at which you should turn them off depends on several factors, including your age and the humidity level ...
Sometimes you can stay hydrated and still run; other times you should just pack it in.
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