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TIL Bipolar disorder may have been a climatic adaptation for humans to survive short summers (manic episodes for high productivity) and long winters (depression to slow metabolism).

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b614j TIL that Spice in Dune is partially an analogue for psilocybin, and the blue eyes are because psilocybin is blue
OGaMX TIL Through helioseismology, astronomers can observe the far side of the Sun and count its sunspots. The Sun's interior is very good at transmitting sound and its soundwaves are used to look through the star
8eAka TIL the colour orange came first because oranges used to be green. Even today some are green in Thailand and Vietnam
4XBxb TIL of Mary Seacole a Jamaican-born nurse who applied to join Florence Nightingale in Crimea, but was turned down due to her race. Instead of giving up, Seacole sailed to the Crimea at her own expense and set up a hotel to tend to sick and wounded soldiers.
e0L9g TIL Scientists have found out what the air was like millions of years ago by using air bubbles in ice.