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TIL There is a species of firefly in the U.S.’s Great Smokey Mountains that synchronize their flashing patterns so that they all light up at the same time.

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R1G1 TIL that in 1968 there were four mysterious submarine disappearances. The USS Scorpion, the Israeli submarine INS Dakar, the French submarine Minerve and the Soviet submarine K-129 all went down.
4kOy5 TIL that The Narmer Palette is an Ancienf Egyptian artefact containing one of the earliest hieroglyphic inscriptions. It describes the unification of Upper and Lower Egypt by King Narmer in ca. 3100 BCE.
9Y5rQ TIL Suriname is a country in South America that uses Dutch as a majority language. Sranan Tongo is a creole language also spoken there, made of English, Dutch, Portuguese, and West African languages. Population includes Natives, Dutch, Indonesian, Indian, Chinese, and runaway slaves (Maroons).
P19nZ TIL early humans and neanderthals did sex acts together and likely gave birth to "hybrid" babies according to studies of ancient teeth
WP48 TIL that those tiny bright moving lines that appear in your field of vision when looking at a clear blue sky are actually your own white blood cells moving in the capillaries in front of your eyes’ retinas.