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TIL there are 5 parasitologists who wrote and are giving away a free textbook on human parasite to everyone because they want to increase awareness/ help cure many preventable diseases.

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rRkKM TIL The Mandarinfish is one of only two species in the world which can produce its own blue coloring. Other animals that appear to be blue such as peacocks, don’t actually produce a blue pigment, they have colorless cells which reflect light to make it appear blue.
pY9Ep TIL Irani cafés are Iranian-style cafés in the Indian subcontinent that were originally opened by Zoroastrian Irani immigrants to British India in the 19th century. In the 1950s, there were 350 Irani cafés; today, only 25 remain.
aGoN TIL that the Schwarzschild Radius is the size an object is compressed in order to make it a black hole. Earth’s Schwarzschild Radius would be compressing it to 8.7 mm, which is roughly the size of a peanut.
rn7w TIL there is a 30 million word gap between rich and poor kids by the age of 3.
VpZ0 TIL as well as the “see no evil, hear no evil, speak no evil” monkeys, there is a fourth monkey called “do no evil”. he is covering his genitals.