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TIL That the word gender wasn’t popularized until around the 80s and overtook sex in determining infants in the 90s

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lnM1 TIL the term ‘friend-zone’ was popularized by Joey in episode 7 of season 1 of friends.
XEyYR TIL that wrinkles in the brain are an evolutionary trait - folds allow more brain matter to fit in the skull without increasing the skull's size.
Br7Od TIL that English used to have a letter for "th", called thorn. That letter was shorthanded to y, therefore "ye olde shoppe"
p8RAb TIL that children with the chromosomal abnormality William's syndrome are known to present with well developed verbal skills, extreme friendliness, and elf-like features.
gMaB7 TIL in an effort to demonstrate time dilation, a father and his kids drove three atomic clocks up Mt. Rainier. The measured effect was just over 20 nanoseconds, matching Einstein's theory of relativity.