A frog dropped into boiling water will hop out in a single, startled ribbitt! But the same poor creature lowered into cool water that then gradually grows hotter will sit blissfully until becoming boiled frog.

At least, that's what high school biology students used to learn, I'm told. Fortunately, I don't know for sure. In my old school, the biology teacher never would have countenanced such a benighted practice—even in the service of education.

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