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TIL After Mark Twain met Helen Keller at a dinner party he was so impressed with her that he wrote to the wife Henry H. Rogers, a wealthy oil magnate, pleading her to convince her husband to support Keller’s education. Mr. Rogers agreed and personally paid her entire education.

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QBNd TIL Dominoes discontinued use of their mascot “The Noid” after a mentally ill Kenneth Lamar Noid, thinking the character was based on him, held a Dominoes hostage and later killed himself.
0wmM TIL That the glottis (the opening in which air passes through when we breathe) expands when we are under heavy stress for increased oxygen intake. This causes the lump you feel in your throat when you are stressed/crying!
rRjny TIL that in late 2013, an 8 year old girl was orphaned after her entire family died because of a batch of old potatoes that her family had let rot in their cellar. Under the right circumstances, potatoes contain a toxin known as Glycoalkaloids, and this was released in gas form as they rotted.
KYEja TIL among the official HTTP client error response codes (like "404: Not Found"), status code "418: I'm a teapot" is the code used to indicate that the server refuses to brew coffee because it is, permanently, a teapot.
9wO4D TIL The 38th book in the Oz (Wizard of Oz) book series, written in 1949, entered the public domain in 1977, but the 39th Oz book, written in 1951, won't enter the public domain until 2047.