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TIL that depression can be a symptom of untreated or poorly-managed ADHD. Chronic under-stimulation can lead to depression as "the ADHD nervous system feeds on interest and challenge".

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OG5r4 TIL that mathematician John von Neumann had an unusual ability to solve new problems. When presented with a problem in programming on which there had been no published literature, he said "Oh, that!", then gave a lecture of over an hour explaining how to solve it using a hitherto unconceived theory
Qjea TIL of Professional Mourners. In ancient Rome, these paid sad people would rip out their hair and scratch at their faces. Having many of them signified great wealth, and the Roman government eventually had to impose limitations on how many the deceased person could have.
4AK5 TIL that when King Tut’s chariot arrived in New York back in 2010 it was classified as a vehicle and was stuck in customs for not having a Vehicle Identification Number.
6RRw TIL Coconuts and coconut cultivation are so old, we don’t know where on Earth they originated
e0nxb TIL throughout the 1970’s the Grateful Dead used a 32ft tall PA system that could deliver perfect sound 600ft away. It had to be hauled in caravans of semi trucks and took 4 hours to assemble. They called it “The Wall of Sound”.