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TIL in the mandrill species, if a beta male wins a fight, then it gradually transforms into an alpha male - gaining larger testicles, more colorful skin, and the ability to produce offspring with females. If an alpha male loses a fight, then the reverse happens.

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P1Qjn TIL that Pythagoras was not the first in record to come up with the idea that the Earth is round due to the shape of the moon. It is not known if Pythagoras actually said this. This is a clerical error made by Thomas Heath in 1915, and has been perpetuated by BBC, NASA and Encyclopedia Britannica.
QJPrL TIL if you clap your hands at the base of a Chichen Itza pyramid, it makes a “bird” sound.
woY11 TIL that acting out during dreams may be an early indicator of brain disease.
pYdp8 TIL Thomas Edison liked to take naps while holding spheres, when he nodded off he'd drop the spheres and be awoken. The naps were meant to drive creativity. A 2021 experiment found the spheres acted as a “hypnagogia catcher” which allowed participants to have more spontaneous thoughts/creativity.
vP4p8 TIL Euler's often wrote the earliest written reference on a given matter. In an effort to avoid naming everything after Euler, some discoveries and theorems are attributed to the first person to have proved them after Euler.