It is the 166th day of the year, with only 199 days remaining until the end of the year.
1667 - The first human blood transfusion is administered by Dr. Jean-Baptiste Denys.
1752 - Benjamin Franklin proves that lightning is electricity.
1775 - George Washington is appointed commander-in-chief of the Continental Army.
1785 - Jean-Francois Pilatre de Rozier and Pierre Roman, become the first-ever casualties of an air crash when their hot air balloon explodes during their attempt to cross the English Channel.
1836 - Arkansas is admitted as the 25th state of the Union.
1844 - Charles Goodyear receives a patent for vulcanization, a process to strengthen rubber.
1864 - Arlington National Cemetry is established when 200 acres around Arlington Mansion, formerly owned by Robert E. Lee, is officially set aside as a military cemetery by Secretary of War Edwin Stanton.
1877 - Henry Ossian Flipper becomes the first African-American cadet to graduate from the United States Military Academy.
1888 - Crown Prince Wilhelm becomes Kaiser Wilhelm II, he will be the last Emperor of the German Empire.
1896 - The deadliest tsunami in Japan's history kills more than 22,000 people.
1916 - President Woodrow Wilson signs a bill incorporating the Boy Scouts of America, making them the only American youth organization with a federal charter.
1934 - The Great Smoky Mountains National Park is founded.
1954 - UEFA, the Union of European Football Associations, is formed in Basel, Switzerland.
1985 - Rembrandt's painting Danae, is attacked by a man who throws sulfuric acid on the canvas and cuts it twice with a knife.