My brother, Dylan, actually taught me this trick. If you place a wooden spoon over a boiling pot, it'll keep it from boiling over.
Which is great to know, because I always boil the water over when I make mashed potatoes and then my stove gets all nasty.
Here's why: The bubbles formed by boiling water are filled with steam, so if anything colder than the steam (ie <100°C) touches a bubble the steam will immediately condense and the bubble will collapse. But it has to been a wooden spoon because a metal spoon will heat up and make this worthless.
You're welcome
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