Mixed reaction: Why, when I am running water using mixer taps, does
the hot water always get very much hotter once I have also turned on the
cold water tap, before settling down to a cooler temperature? Wendy Bines
South Nutfield, Surrey
* * *
Crying game: Why do people cry or laugh when they are sad, hurt, happy
or think something is funny 鈥� or why do they even cry or laugh at all? Did
someone invent these actions or do they come naturally? Did early humans
laugh or cry? Lulu Kalman (aged 11) Rome
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