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TIL that Stephen Hawking used a single cheek muscle to communicate. A sensor attached to his glasses detected these movements which in turn moved a cursor on a screen that utilized predictive text. Much of this text was personalised to Hawking and was based on phrases he had previously used

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J1aR4 TIL about Mordecai 'three finger' Brown. A MLB player who had his pitching hand mangled in a farm accident. The injury gave him a unique grip on the baseball that gave him an unusual amount of spin on the ball. He is in the Baseball Hall of Fame.
WpJ4 TIL that at age 9, Ron McNair, the African-American astronaut later killed in the Challenger explosion in 1986, refused to leave a segregated public library after the librarian rejected his request to check out some books. The police were called, as was his mother.
KOnQ6 TIL of the United States Army Pigeon Service whose pigeons were trained for communication and reconnaissance purposes during WWII. During the war, the force consisted of 54,000 war pigeons and over 90% of their messages were received successfully (with some earning medals for saving Allied lives).
LkYp TIL that the first thing Buzz Aldrin did upon stepping foot on the moon was to hold a communion service but NASA kept it a secret because they were “still smarting from the lawsuit filed by Madalyn Murray O'Hair” regarding the Genesis readings on Apollo 8.
ne6rW TIL that 2,400-year old ruins where found on the northern coast of Greenland, more than 300 miles north of the current northernmost town in the world.