Which freezes faster, hot water or cold water?

Physicists are apt to tell us that they have all the basics well-explained, and if you want to learn anthing truly new, we need $30 billion for a new supercollider or a new space telescope. I appreciate learning about mundane phenomena that challenge physical theory. Many of them involve water.

Here’s an experiment that you can try in your kitchen with just a few minutes’ effort that can help settle a 50-year-old controversy in physics. Put a bowl of boiling water and an identical bowl of room-temperature water into your freezer, and check back an hour later to see which one freezes first.

Then you can read about the Mpemba effect.

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