Great idea for a thread but it should be in the history section. Not much happened on August 13th but on August 14, 1945, President Harry S. Truman announced that Imperial Japan had surrendered unconditionally, ending World War II.
1536 Buddhist monks from Kyōto's Enryaku Temple set fire to 21 Nichiren temples throughout Kyoto in the Tenbun Hokke Disturbance. (Traditional Japanese date: July 27, 1536). NAM MYOHO RENGE KYO!
1942 The 'Manhattan Project' commences, under the direction of US General Leslie Groves: its aim - to deliver an atomic bomb