According to the conventional view of history, humans have only walked the Earth in our present form for some 200,000 years. Advanced civilizations appeared several thousand years ago, but much of the mechanical ingenuity we know in modern times began to develop only around the Industrial Revolution a couple hundred years ago.

Oopart (out-of-place artifact) is a term applied to dozens of prehistoric objects found in various places around the world that seem to show a level of technological advancement incongruous with the times in which they were made.

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