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TIL Yawns are contagious because of social mirroring, which makes animals mimic social cues due to mirror neurons in the brain.

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NXdb6 TIL the US-Canada border is the longest international border in the world, and that Alaska's portion alone is about 38%.
GY95j TIL Theodore Roosevelt as a child, watched Lincoln’s funeral procession pass by his house. His admiration for Abe was reinforced later in life when he met John Hay, who was Abe’s secretary. Hay gifted a ring that contained Lincoln’s hair to Teddy. Teddy then wore the ring on his inauguration day.
dODr TIL MLK told 60 Minutes that “A riot is the language of the unheard”
J1nNQ TIL that Kurt Cobain's guitar, a 1959 Martin acoustic used during the MTV Unplugged performance, sold at auction in 2020 for $6 million - making it not only the most valuable guitar, but also the most valuable piece of rock music memorabilia of all time
e0YjD TIL: There are locations on planet Mercury where during a day the sun will appear to pause, reverse direction, then continue forward again as it moves across the sky. This happens as the planet’s angular orbital velocity and angular rotational velocity flip as it crosses perihelion