The Coso Artifact
A rock was found in the mountains of California in 1961, and an object made of white porcelain was found inside. There was shiny metal in the center. X-rays revealed a tiny spring in the end, that looked like a spark plug. The artifact itself was defined by experts as a spark plug dated the 1920's. Unfortunately, the Coso Artifact was lost and can not be fully researched. Is there a reasonable explanation of the artifact? How could the spark plug be in the 500 000-year-old rock?