The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
In 1537, England's King Henry VII officially declared February 14th the holiday of St. Valentine's Day.
52
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.
21
In the 1830s, a Greek prime minister tried to spread the potato in Greece but people weren't interested so he put armed guards in front of shipments of potatoes so people would think they were important. People then started stealing these potatoes so much that the crop spread to all of Greece.
29
During the Black Plague, it was thought that bad smells were the cause of the plague. "Plague Doctors" therefore wore masks with long beak-like noses stuffed with flowers or smoke to hide the smells.
19
Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
153
Peanut butter and jelly sandwiches were originally considered a delicacy, only enjoyed by those of the upper class.
9