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TIL that in 1931 Albert Einstein sent a letter to Sigmund Freud titled "Why War?" to better understand the psychological causes of war. Freud responded that biological evolution, inherent power differences within groups, and the paradox of peace (times of peace allow empires to be built) cause war.

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nWPB TIL the head of the Gestapo disappeared after WWII and his fate remains a mystery.
ADEox TIL Prince created a video game in 1994 called Prince Interactive. The game was similar to Myst, and it featured Prince's music and his recording studio Paisley Park.
yd48 TIL in 1998 Serena Williams claimed she could beat any male tennis player ranked over 200, Karsten Braasch, ranked 203 at the time, accepted the challenge and beat Serena 6-1, followed by Venus 6-2. Subsequently Serena then changed her claim to any male player ranked over 350, but never challenged.
4X8yb TIL that the percent of of a NCAA college athletes “going pro” (becoming a professional level player) is less than 2% for all sports, except men’s ice hockey (5.6%) and baseball (9.1%)
jN9Vj TIL That in Iceland, Elves (called Huldufólk) are such an important part of Icelandic folklore, that several building projects have been altered in order to not disturb their homes.