Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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Until President Kennedy was killed, it wasn't a federal crime to assassinate the President.
341
The flushing toilet was invented in 1596, not by Thomas Crapper as most people think, but by Sir John Harington.
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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