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TIL In Japan doctors would prescribe "Forest therapy" to treat depression and anxiety. The scent of the trees increases activity of the natural killer cells that enhances your immune system which boosts resistance against stress.

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1ak14 TIL that the ancient Egyptians had structures marked with cubit scales—now called "nilometers"—to measure the Nile River's water level during the annual flood (the foundation of their civilization), to predict how much it would fertilize their cropland and whether the flood would be destructive.
xmXw TIL that old school medicine cabinets had a slot at the back to dispose of razor blades, but they went straight into the drywall. This has caused many incidences of people finding hundreds of accumulated razorblades in their walls when renovating.
6ONZ TIL the #1 one killer of police officers is law enforcement suicide. Law enforcement suicide occurs 1.5 times more frequently compared to the general population.
XoVj TIL that giant and colossal squids’ brains are donut-shaped and encase their esophagi - and that swallowing anything larger than 10 mm in diameter can result in brain damage.
v1yj4 TIL about Unit 731, a Japanese complex that during WW2 performed lethal biological and chemical experiments to over 3000 people, carrying out some of the most notorious war crimes in Japanese history.