Approximately 25,000 workers died during the building of the Panama Canal and approximately 20,000 of them contracted malaria and yellow fever.

The word vaccine comes from the Latin word "vacca," which means cow. This name was chosen beacause the first vaccination was derived from cowpox which was given to a boy.

The winter of 1932 was so cold that Niagara Falls froze completely solid.

AMAZING FACTS