At CES, Thomas Edison materializes in the mist to help you win a free iPad

They say the ghosts of CES past sometimes roam the halls of the Las Vegas Convention Center. Lonely souls, forever trapped in show floor purgatory, searching for someone — anyone — to free them from existential limbo. Sometimes that ghost is Thomas Edison, and this year, he wants to help you win a free iPad. But not before he shoots off another tweet from the aether.