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OG5N7 TIL drown reefs are a thing caused when the water level is high enough that it blocks out too much sunlight needed by some coral species
QNPKp TIL that the US Navy's ALVIN deep ocean research submersible that was used to discover the Titanic was constructed by General Mills, most famous for its breakfast cereal brands.
gMkg9 TIL the Antikythera Shipwreck of the First Century BCE, discovered by Greek sponge divers, yielded artifacts including art, jewelry, a statue of Herakles, coins, but most importantly the Antikythera Mechanism, interlocking gears that computed the movements of the sun, the moon, and eclipse dates