Magnets Crackle!

Ever hear a magnet crackle? Neither have I.

What do we mean by ``crackling noise'' in magnets? Paper makes crackling noise when we crumple it into a ball: it crumples in a lot of jumps, some big, some small. Each jump is where a small part of the paper bends or jumps into a new place.

Magnets make the same kind of noise when you magnetize them.