› added 2 years ago

69

TIL of the Dicker-rod, a device intended to replace the first down chains commonly used to measure 10-yard distances during games of gridiron football.

Read more wikipedia.org

via reddit.com

6Ea18 TIL McDonalds managers make more on average than teachers in most US states
M7OA7 TIL that electricity flows around copper wires, not through them.
groB7 TIL the first German woman with a Chemistry Ph.D. was married to Fritz Haber — a chemist known for supporting nearly half of the world's population's food supply through the synthesis of ammonia from the air and also for being the "father of chemical warfare." The latter would lead to her suicide.
kAA1 TIL: According to the federal census of 1830, free blacks owned more than 10,000 slaves in Louisiana, Maryland, South Carolina, and Virginia.
5VwGk TIL a plane can go faster than the speed of sound but not make a sonic boom