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TIL that during The Great War Britain ran out of binoculars, so they turned to the leading manufacturer of optics to buy them: Germany. In turn Germany bought from Britain what they most needed: rubber.

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ORLg TIL that biliverdin, the pigment that gives robin eggs their blue color, is the same pigment that makes bruises look blue.
G9Vj TIL in 2010 Tupac’s song ‘Dear Mama’ was inducted into The Library of Congress Registry with The LOCR stating it is “a moving and eloquent homage to both the murdered rapper’s own mother and all mothers struggling to maintain a family in the face of addiction, poverty and societal indifference.”
78ylP TIL Some species of hermaphroditic flatworm engage in a violent "penis fencing" ritual when mating. The winner of which stabs the other with its sharp tip and inseminates the loser.
ZKVB TIL that there was a planned, but unmade episode of Doctor Who in which an alien would attach itself to JK Rowling and project her imagination on the real world. The Doctor would have battled wizards and witches to save the planet.
NKxP TIL there are only four original citrus species (pomelo, citron, mandarin, and papeda). All others (lemon, lime, grapefruit, etc.) are hybrids.