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TIL the 1883 eruption on Krakatoa produced the loudest sound ever known it reverberated around the globe 7 times before diminishing. It could be heard 4,000 miles away, and people with in 100 miles had permenant hearing loss.

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grZXy TIL that 218 species and subspecies of primates across the globe are currently threatened by roads, railways, pipelines, and transmission lines. That is nearly half of all primates species in the world.
XEXJk TIL that "Fight Club" author Chuck Palahniuk's short story "Guts" made people faint at his book readings.
epBe5 TIL Roman concrete's durability is a result of hot mixing, which creates lime clasts that "self-heal" cracks whenever they are exposed to water.
neQGB TIL The Germans possessed the largest calibered rifled weapon ever used in combat. It was a railway mounted artillery gun that weighted 1.3 million kilograms (3 million pounds) and was capable of firing a 7,000kg (15,000lb) shell 47 kilometers (29 miles). It was destroyed by the Germans in 1945.
5YAeQ TIL that all But one U.S. President are descendants of King John, the signer of the Magna Carta and villain of Robin Hood.