Boston Massacre (Incident on King Street): British soldiers kill 5 men in a crowd throwing snowballs, stones and sticks at them. African American Crispus Attucks 1st to die; later held up as early black martyr. The massacre galvanized anti-British feelings.
Nicolaus Copernicus' revolutionary book De revolutionibus orbium coelestium is banned by the Catholic Church. In the book, Copernicus claimed that the Earth revolves around the sun. The Church maintained Ptolemy's geocentric system. The book is considered a milestone in the history of astronomy.