It does, or maybe it simulates caring, that's the whole idea of machine learning, if it didn't care there would be no reason to change the original random playing to play better.

Imagine giving a monkey a piano to play randomly. Every time you like what it plays you give it a banana and every time you don't you slap it with a rolled newspaper. Do it for a year or two and you get a composer monkey to tour the world with and make money. That's machine learning just with a monkey instead of a computer simulating a brain.

You can’t define good music and can’t write a computer program to do it. Monkey doesn’t even know what music is, and would be totally lost if given a guitar instead. But the result works out.

Those are not regular magnets, they're superconductive magnets. Superconductive materials need to be cold to stay superconductive, if they warm up they stop being so and this leads to electric resistance reappearing. If there is resistance in the wire you're losing a lot of electricity to heating the wire instead of producing magnetic field.

Tournament armor was heavier than battle armor, and they were using blunted weapons. It was a sort of sport, modern boxers can get a concussion too, they still do it for fame and money, and so did the knights.