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TIL the first blood transfusion from animal to human, was done by Dr. Jean-Baptiste Denys, physician to King Louis XIV of France. He transfused the blood of a sheep into a 15-year-old boy, who survived likely due to the small amount of blood transferred, helping to withstand an allergic reaction.

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xVBBw TIL that naturally occurring magnets (lodestones) are only formed when lightning strikes magnetite, an iron ore.
Q0Ne TIL that before Billboard took control of the Canadian singles chart in 2007, the #1 song was Nine Inch Nails’ “Survivalism” - the fifth rock-oriented #1 that year. The first #1 on the revamped Canadian Hot 100 was “Umbrella” by Rihanna. Not a single rock song has hit #1 since.
9w8G TIL The crew of the Challenger likely survived the explosion and died upon impact with the ocean.
5p0p TIL wheeltappers used to use long-handled hammers to physically tap the wheels of trains, determining from the ringing sound if they were cracked or not.
4ARo TIL billionaire Tom Perkins spelled out a secret message using nautical code flags strung along the length of his enormous yacht. The message? “Rarely does one have the privilege of witnessing vulgar ostentation displayed upon such a scale.”