The Whistle is a Warning

Do you know how the tea kettle works? It's simple. You fill up the kettle, leaving some room at the top. There is a small pour spout on top with a hinged lid. The water slowly heats up as pressure increases inside this closed pressure vessel. Once critical mass is achieved and the water is boiling, the pressure inside causes the kettle lid to crack and whistle. The water is ready for making tea. I won't mention the person, but I heard a story this week that got me thinking about the tea kettl...