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TIL that male ducks grow new penises each year during the mating season. Their penis size is influenced by social environment. In research studies, the ducks housed in co-ed environment grew longer penises than those housed in pairs, likely because the ducks in groups were competing for mates.

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JY55B TIL that ex KGB and President of Azerbaijan, Heydar Aliyev, died in Cleveland, Ohio
V41Z TIL that there is an optical illusion called the McCullough Effect that is so powerful, ten minutes of exposure can cause you to see colors that are not there for up to a month.
gRBL TIL microneedle patches are being developed to replace hypodermic needles.
ERRX TIL the song “I Want a Monster to Be My Friend” from Sesame Street was removed from the show after a mother complained about the lines “If I make friends with a friendly monster, I’ll let him bounce me on his knee. I’ll let him do whatever he wants to especially if he’s bigger than me.”
vLx4 TIL that in 1859, English settler Thomas Austin released only 24 rabbits onto his property in Australia, stating “The introduction of a few rabbits could do little harm and might provide a touch of home, in addition to a spot of hunting.” By the 1920’s the population reached 10 billion.