Yeast is what makes bread dough rise. If the yeast is fresh/live/active, it will get foamy when mixed with warm water and a little sugar. Foam is what you get on top of the liquid when you pour a glass of beer.
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lazzy boy is the word 'drizzle' used quite often or do you say 'light rain'?I say both. I take drizzle to consist of very fine droplets of rain densely spaced, while I take light rain to be average sized drops that are more like real rain, but just not as much falling at once.