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TIL that the probability of having a doppelganger (non-biologically related look-alike or double of a living person) is only one in a trillion, or almost zero. This makes it highly unlikely for any person to actually have a doppelganger, according to this University of Adelaide research.

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16ybO TIL that Acacia trees developped a defense response to giraffe browsing by increasing their thorn length, tannin production within leaves and airborne tannin release. This triggered a change in the giraffe's behaviour which adapted to move upwind and eat fewer leaves per trees.
epnB4 TIL about Abul-Abbas. An elephant sent by the caliph Harun al-rashid ibn Muhammad al-Mahdi to the holy Roman emperor Charlemagne as a gift that symbolized the beginning of Abbasid-Carolingian relations. The elephant died in 810 just as charlemagne crossed the rhine.
woOKY TIL of "Historia Piscium," a book about fishes published in 1686 by the Royal Society. The book sold so poorly that the Society reneged on funding Isaac Newton's "Principia". Clerk Edmund Halley funded Principia himself; the Society later paid him with unsold copies of Historia
MMO8 TIL that it’s not 2013 in North Korea. The year is 102, because North Korea marks years from the birth of Kim Il-sung, not Jesus.
JYgYv TIL an endangered parrot in New Zealand would only mate with people's heads, so they made an ejaculation helmet for people to wear, the parrot to fuck and the helmet to collect the rare semen.