Super-Strong Magnet Literally Blew the Doors Off a Tokyo Laboratory

There's a magnet in a secure room in central Tokyo. It's an electromagnet, the kind that generates a magnetic field when electrical current flows through it. The last time the scientists who operate it switched it on, it blew open the heavy doors designed to keep it contained. Already, it has created one of the most intense magnetic fields ever generated on Earth. And it keeps getting more powerful.