An intricate crop circle recently cut into a field two hours south of San Francisco baffled onlookers and spawned crackpot theories that aliens were responsible, but sources tell me it was created by Nvidia to publicize a big CES announcement. The design looks like Nvidia’s Tegra 4 chip, and though we can’t confirm this, it may be designed to drum up interest in the Tegra 5 chip Nvidia is expected to launch at CES.