- 1667 French physician Jean-Baptiste Denys performs the 1st human blood transfusion
- 1678 Venetian Elena Cornaro Piscopia is awarded a doctorate of philosophy, the 1st woman to receive a university doctoral degree or PhD
- 1876 Battle of the Little Bighorn: US 7th Cavalry under Brevet Major General George Armstrong Custer wiped out by Sioux and Cheyenne warriors led by Chiefs Crazy Horse and Sitting Bull in what has become famously known as "Custer's Last Stand"
- 1929 US President Herbert Hoover authorizes building of Boulder Dam (Hoover Dam)
- 1950 North Korea invades South Korea, beginning the Korean War
1st version of Anne Frank's diary "Het Achterhuis" published in The Netherlands
On June 25, 1947