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Playing With Magnets in a Copper Pipe

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YouTube / HedgehogTH

In this video, we see what happens when you drop powerful neodymium magnets through a short length of thick copper pipe, demonstrating Lenz's law. Long science story short: the magnets fall very slowly. The effect is really neat, and the video very simple (it's just one shot of a guy dropping magnets through a pipe...), but don't try this at home. Fooling around with strong magnets can hurt you. Fortunately, we have dudes on the Internet who'll do it for us:

(Via Devour.)

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Things You Didn't Know Came From Washington, D.C.
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From binder clips to telegraphs, inventions from the nation's capital have been making our lives more efficient for more than a century.

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Here's Where a Few More Harry Potter Names Came From
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The world of witchcraft and wizardry is full of linguistic secrets. Here's a few of our favorite Harry Potter names and the meanings behind them.

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