In the latest example of an advertisement to go viral, a "mysterious" crop circle found in Chualar, near Salinas, Calif., turned out to be a stunt by Silicon Valley chipmaker Nvidia.

The intricate design etched into a field of barley two hours south of San Francisco was spotted Monday morning by Julie Belanger, a photographer, as she and her husband were flying over.

A new photo claiming to be a 1,000-foot-wide UFO near the Four Corners is sending the internet into a frenzy over whether it's the real deal -- or just an optical illusion.