God, How I hated the 70's: Gary Dahl, Inventor of the Pet Rock, Dies at 78

God, How I hated the 70's: Gary Dahl, Inventor of the Pet Rock, Dies at 78: By MARGALIT FOX It was a craze to rival the Hula-Hoop, and even less explicable. For a mere three dollars and 95 cents, a consu...