On this day in 1847, a group of Cayuse tribespeople killed 13 people at the Whitman Mission, as they believed that physician and religious leader Marcus Whitman was deliberately spreading measles.

On this day in 1775, physician and amateur chemist James Jay invented a new kind of invisible ink, which was later put to use in the American War of Independence. 

 

See omnystudio.com/listener for privacy information.