Scientists learn the secret of a famous anti-superconductor

Magnetite is, as its name implies, one of the most naturally magnetic materials on earth. Millennia ago, it was what first clued scientists in to magnetism. But magnetite is also something of a mystery. At low temperatures, the rock completely stops all electricity. At last scientists have figured it out why. »12/23/11 7:20am12/23/11 7:20am