Ethel, the Early-Warning FrogIf you throw a frog into hot water, she'll jump out. But if you put her in tepid water and turn the heat up slowly, she'll get used to it and stay until the water's so hot it boils her.
Unless, that is, she's a very smart frog and catches on quick. Then when the heat gets too much for her, she jumps out before she gets boiled. If the other frogs see her, they might jump out in time, too. That makes her an
The Early-Warning Frog
