The magnetic mystery
Discovery
00:00
The Magic of Levitating a Crystal
I was visiting St Andrews in Scotland when I saw a crystal levitating. It seems to be magic, so probably magnets are involved, right? So that seems pretty magical. But actually, when you study magnetism at university, you learn that this is actually even more magical. Earnshaw's theorem says that it's impossible to statically levitate one magnet above another one. You can levitate stuff with magnetism, but it has to be moving, as it is with the Maglev trains.
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