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TIL the recipe for Angostura Bitters is a closely guarded secret, with only one person, passed hereditarily, knowing the whole recipe.

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b6VE TIL that our eyes adjust to light or dark areas by either breaking down or combining ingredients of a chemical in our eyes.
dED7 TIL: Astronauts can lose up to 22% of their blood volume while in space.
egyn TIL that the first person to discover sperm, Antonie van Leeuwenhoek, kept his discovery secret for 23 years out of fear of embarrassment.
Wgad TIL there are more species of fish found in the Amazon river then are recorded in the entire Atlantic ocean.
o9yK TIL Crows have different warning calls – one for cats, and one for hawks, and another for humans – 250 in all