May 12
1847: William Clayton invents odometer.
1942: Some 1,500 Jews are sent to the gas chamber at Auschwitz.
1998: The Trisakti Tragedy. Four Trisakti students in Jakarta are shot dead by security apparatus while demonstrating in front of their campus.
2006: US sprinter Justin Gatlin brakes the world record 100-meter sprint in 9.77 seconds in Doha, Qatar.

May 13
1913: Igor Sikorsky flies the first four-engine aircraft in the world.
196...