OnThisDay: April 1st
1578 - William Harvey of England discovers blood circulation
1748 - Ruins of Pompeii found
1789 - US House of Representatives first full meeting, New York, NY
1826 - Samuel Mory patents internal combustion engine
1889 - First dishwashing machine marketed (in Chicago)
1945 - US forces launch invasion of Okinawa during WWII
1976 - Stephen Wozniak & Steven Jobs originate Apple Computer
1986 - World oil prices dip below $10 a barrel