The Bureau of Engraving and Printing produces 38 million notes a day with a face value of approximately $541 million. That doesn't mean there is $541 million more money circulating today than there was yesterday, though, ...Read More

In an effort to solicit cash to pay for a charity Christmas dinner in 1891, a large crabpot was set down on a San Francisco street, becoming the first Salvation Army collection kettle.

Ben Franklin's "single fluid theory" showed that a given body possessing a normal amount of electric fluid was called neutral. During the process of charging, the fluid was transferred from one body to the other; the body ...Read More

Medical treatment, during the seventeenth and eighteenth centuries, was aimed at ridding the sick of "vile humours" by vomiting, purging, and bleeding. The treatment was often the immediate cause of death. Some ...Read More

Tyrannosaurus ('tyrant lizard') is the most famous dinosaur genus and a fixture in popular culture. Known colloquially as T. rex, the species Tyrannosaurus rex hails from what is now western North America. Tyrannosaurus ...Read More

The first crosswords appeared in England during the 19th century. They were of an elementary kind, apparently derived from the word square, a group of words arranged so the letters read alike vertically and horizontally, ...Read More