While mineral hunting in the mountains of California near Olancha during the winter of 1961, Wallace Lane, Virginia Maxey and Mike Mikesell found a rock, among many others, that they thought was a geode – a good addition for their gem shop. Upon cutting it open, however, Mikesell found an object inside that seemed to be made of white porcelain. In the center was a shaft of shiny metal. Experts estimated that it should have taken about 500,000 years for this fossil-encrusted nodule to form, yet the object inside was obviously of sophisticated human manufacture. Further investigation revealed that the porcelain was surround by a hexagonal casing, and an x-ray revealed a tiny spring at one end. Some who have examined the evidence say it looks very much like a modern-day spark plug. How did it get inside a 500,000-year-old rock?