Imagine the life of a yeast cell, floating around the kitchen in a spore that eventually lands on a bowl of grapes. Life is good: food for days, at least until someone notices the rotting fruit and throws them out. But then the sun shines through a window, the section of the counter where the bowl is sitting heats up, and suddenly life gets uncomfortable for the humble yeast. When temperatures get too high, the cells shut down their normal processes to ride out the stressful conditions and live to feast on grapes on another, cooler day.
