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TIL that the world's fastest land animal was named Sarah, a South African cheetah who, at age 11, ran 100m in 5.95 seconds (or 61 mph). She lived in the Cincinnati Zoo and passed away at 15 years of age in 2016.

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5VQpQ TIL beneath the Puerto Rico Trench is a mass so dense it has a gravitational pull on the surface of the ocean, causing it to dip somewhat. The Trench is also associated with the most negative gravity anomaly on earth, -380 milliGal, which indicates the presence of an active downward force.
8e8oX TIL that the first airline started in 1914, with scheduled service between Tampa and St. Petersburg, Florida. The flight took 23 minutes at a cruising altitude of 5 feet.
oB7QY TIL of Harold Shipman the most prolific known serial killer in the world, a doctor who was "addicted to killing", murdering an estimated 215-260 of his patients.
KOpwR TIL that before trees (~400 million years ago) the Earth's landscape was dotted with 24ft tall, 3ft wide mushroom spires called Prototaxites
b9JWj TIL A needlegun is a firearm that fires small, sometimes fin-stabilized, metal darts or flechettes. Theoretically, the advantages of a needlegun over conventional projectile firearms are in its compact size, high rate of fire, and extreme muzzle velocity.