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TIL Bees could see the color difference between two pieces of “white” paper. Researchers used zinc white for one paper and lead white for the other, and although these look exactly the same to us, the bee could easily distinguish them, because they reflect a different amount in the ultraviolet

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Oore4 TIL in 1991 it was discovered that the heart has its "little brain" or "intrinsic cardiac nervous system." This "heart brain" is composed of approximately 40,000 neurons that are alike neurons in the brain, meaning that the heart has its own nervous system.
4xxo TIL that Wales’ national symbol is a leek because on the eve of the battle against the Saxons, St David advised the Britons to wear leeks in their caps so as to easily distinguish friend from foe. This helped to secure a great victory.
ldQa TIL: The ‘Interplanetary Transport Network’ is a collection of gravitationally determined pathways through the Solar System that require very little energy for an object to follow.
Bgbrd TIL in 2013 the UK government officially detained a portrait of renaissance singer Barbara Salutati. It was sold to a private buyer abroad but the government intervened to block it from leaving the country, citing cultural significance, on account of Barbara being Machiavelli's mistress
MeM4B TIL that right before he boarded his ship, cosmonaut Vladimir Komarov said, “I'm not going to make it back from this flight.” He became the first person ever to die on a mission to space.