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Coinciding interests can sometimes be quite smelly, and costly. Lacking a way to get around, yeast need a ride. To grab a cab, brewer’s yeast produce fruity aromas that attract fruit flies. Alas, the ticket to ride is a sacrifice gambit. Some yeast become lunch. But enough get attached to these nomadic flies and survive to travel to the ripe and rotting fruit that both yeast and fly prefer.
