Who manufactured this machine part 300 million years ago -- long before humans ever arrived on this planet? Even before dinosaurs existed! That's the question some scientists are puzzling over with the discovery of this metal artifact that looks like it's part of a gear mechanism. It was dug out of a piece of coal estimated to have formed about 300 million years ago.
Found in the the Chernogorodskiy mines of the Khakasis region of Russia, the enigmatic metal piece is the latest in a long list of ooparts -- out-of-place items that, according to conventional history, should not exist. But many other such artifacts have been discovered embedded in coal, rock, and ancient strata of earth. See more of them here.