Why are "black diamond" truffles worth $900 per pound?

The black Périgord truffle, revered among foodies for its unique scent, has become so rare that it sells for $900 per pound. But not for long. A team of chemists have begun to reverse engineer the secret of its rare scent, and could one day flood the gourmet market with cheap replacement proteins. » 12/09/13 3:05pm 12/09/13 3:05pm