› added 4 years ago

68

TIL that a "perfect number" is one that that is the sum of its factors excluding itself, e.g. 1+2+3=6.

Read more wikipedia.org

via reddit.com

78Zdx TIL the Canfranc Railway Station linking France with Spain was the second largest station in Europe at 240 meters in length when completed in 1928. It was a hub for trafficking of spies, refugees (including artists Ernst and Chagal), and more than 100 tons of gold during WW2.
A7nw TIL that the solution of the Monty Hall problem (that asks to pick one of three doors to win a car, the picked door remains closed and the third one opens, then asks if you want to switch or not) is so counterintuitive that mathematician Paul Erdos was unconvinced until he saw a simulation of it
rNXD4 TIL that the WWII submarine USS Tang sank two Japanese freighters in 1944 and was then sunk by one of her own torpedoes. Of the 78-man crew, nine survived and were rescued by the same Japanese frigate that had rescued sailors from the freighters the Tang had sunk the night before.
XXQE TIL if you have no debts and have $10 in your pocket you have more wealth than 25% of Americans
WmR9 TIL the Nazi’s used German boxer Max Schmeling in propaganda after he beat African American Joe Louis. Schmeling disliked the Nazis, he refused Hitler’s gifts and hid Jewish children during Kristallnacht. He would later becomes friends with Louis and was a pallbearer at his funeral.