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TIL that 4 hippos from drug kingpin Pablo Escobar’s private zoo have multiplied into as many as 50 roaming free in Colombia as the largest invasive species in the world.

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16JRd TIL when snowflakes hit water they create a screeching sound too high for humans (but not some sea animals) to hear. When a flake hits the water, an air bubble is released that oscillates in the 50-200 khz range well above a human's range. Snow hitting water can increase underwater sound by 30 db.
5MKB TIL that in the 60s, most people used just one Alka-Seltzer tablet at a time. They created the popular “Plop, plop, fizz, fizz” jingle to encourage people to use two tablets — sales nearly doubled.
ep60n TIL Phil Mickelson finished in 2nd place at the U.S Open major golf championship 6 times without ever winning. It is the only major championship he hasn't won and he holds the record for most 2nd place finishes without a win for a specific major tournament.
7xMP TIL R Kelly’s had his first girlfriend at 8 years old. She was murdered by some other children when she was pushed into a creek and drowned. Her last words were his name.
vLVD TIL Grave of the Fireflies is based on the authors own experiences as a child and was written as a personal apology for not being able to save his younger sister Keiko.