11 August in history.

1973

The birth of hip hop. At a back-to-school party in the Bronx, DJ Kool Herc played the drum breaks of records again and again. It is remembered as the birthday of hip hop.

Wikipedia: Hip-hop

Photo: Richard Alexander Caraballo / Wikimedia Commons (CC BY 3.0)

More from 11 August

1. 

   1858

   The Eiger is climbed

   Charles Barrington and two guides made the first ascent of the Eiger in Switzerland.

   Wikipedia: Eiger

   Photo: Terra3 / Wikimedia Commons (CC BY-SA 3.0)

2. 

   1929

   Babe Ruth's 500th home run

   Babe Ruth hit the 500th home run of his career, a milestone no player had reached before.

   Wikipedia: Babe Ruth

   Photo: Irwin, La Broad, & Pudlin. / Wikimedia Commons (Public domain)

3. 

   1942

   Hedy Lamarr's invention

   Film star Hedy Lamarr and composer George Antheil patented a frequency-hopping system, an idea later used in Wi-Fi and Bluetooth.

   Wikipedia: Hedy LamarrWikipedia: Frequency-hopping spread spectrum

   Photo: Unknown author / Wikimedia Commons (Public domain)

4. 

   1992

   The Mall of America

   The Mall of America opened in Minnesota, with an indoor theme park in the middle.

   Wikipedia: Mall of America

   Photo: Farragutful / Wikimedia Commons (CC BY-SA 4.0)

Moments chosen for discovery, creativity and courage. Each one links to a source where you can read more; photos are credited to their owners.