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TIL that author J.K. Rowling often relied on the fan-made Harry Potter Lexicon while writing the 'Harry Potter' books: "I have been known to sneak into an Internet café while out writing and check a fact rather than go into a bookshop and buy a copy of 'Harry Potter', which is embarrassing."

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GYldG TIL Mathematician Leonhard Euler memory was said to have been so great that he was able to recite Virgil's Aeneid from beginning to end without hesitation. A text that is over 9000! lines long.
R59Ow TIL that the anticoagulant coumadin (aka warfarin) was derived from a substance found in moldy clover that was killing cattle. The name "warfarin" comes from the Wisconsin Alumni Research Foundation (WARF), which sponsored the research.
MEDK TIL that the Presidents of the United States from the end of the Civil War until the 1890s were called the ‘Forgettable Presidents’ because they were either impeached, assassinated, disgraced by their own party, surrounded by corruption, or possibly fraudulently elected
oRAd8 TIL that there’s a rarely-sung fourth verse of "The Star-Spangled Banner" that includes the line, “In God is our trust.” This verse is typically left out in public performances and media, partly due to tradition and secularization—even though "In God We Trust" is still printed on U.S. currency.
R5wJ6 TIL The Twilight Zone's Rod Serling tested parachutes as a part time job. The amount of money he earned depended on the danger of the jump. In one instance, he earned $1,000 for testing a jet ejection seat that had killed the previous three testers.