Hot and frothy Please help settle a friendly argument about coffee. Does a latte cool faster than a cappuccino, all else being equal (initial temperature, volume, etc.)? My friend thinks the foam on a cappuccino will insulate it better, but I reckon this effect is offset by the cappuccino having a smaller volume of hot milk.
David Shaw,
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Thurso, Highland, UK
Viral virtue We hear about humans having and needing “good bacteria”. Are there similarly “good viruses” in our bodies?
Barry Alper,
Oxford, UK
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