There was an elaborate crop circle that appeared last week in a grain field in California. No, it wasn't an effort by M. Night whositz to rebuild his career. It was a stunt by chip-maker Nvidia. "This is a confession,” said Jen Hsun Huang, CEO of Nvidia during a news conference in Las Vegas on Sunday, before he explained how his company came to create the circle in a field of barley near the town of Salinas.