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TIL the Blue Hole is among the deadliest dive sites globally, with estimates of 130 to 200 recent fatalities, making it one of the most dangerous spots for divers.

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4kmVw TIL The mantis shrimp, known for its vibrant colors and extremely complex eyes, possesses one of the most sophisticated visual systems in the animal kingdom. It can see both ultraviolet and polarized light and has twelve different types of color receptors, compared to humans who only have three.
9wpwm TIL that Sesame Street was designed to build up the self-worth of black children through the presentation of positive black images. It purposefully presented an integrated, harmonious community to challenge the marginalization of African-Americans routinely seen on elsewhere in society
mx6kv TIL Tolkein popularised "dwarves" as the plural of "dwarf" to differentiate his fantasy dwarves from humans with dwarfism, for whom the correct plural was "dwarfs". The dwarf trope became so entrenched that "dwarves" is now widely recognised as the standard plural of "dwarf" even for humans
j6ZVa TIL: OSAM-1 is a NASA spacecraft designed to test on-orbit refueling of satellites. Its launch is currently planned for no earlier than 2025. Its first objective would be the complex refueling of Landsat 7, an existing satellite launched in 1999.
9wyG7 TIL at the Battle of Red Cliffs in 208 AD, Chinese General Cao Cao captured the naval port of Jiangling and seized a river fleet. He lashed his boats together into clusters to stabilize them for queasy troops. Enemy troops lit their own boats on fire and sent them at the fleet, burning them all down