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TIL about Utroba(Womb) cave in Bulgaria which was not only carved to resemble a vagina but they carved a phallus shaped opening in the ceiling so the sun projects the shape at the entrance of the cave

Read more tourism.government.bg

via reddit.com

pw14 TIL that Jackie Chan is a classically trained opera singer.
nYPG TIL that Michigan has a bottle deposit of 10 cents, instead of the usual 5 cents. Their recycle rate is 97%, compared to 70% of states with bottle deposits, compared to 33% for states without any deposit laws.
bma9 TIL that, for unclear reasons, engineers and engineering students have a significantly above-average likelihood to engage in terrorist activity
woKb7 TIL antivenom is made by injecting small amounts of venom into farm animals until they produce antibodies which are then extracted via drawing the animal’s blood.
rNlnW TIL there are 80,000 Americans living in Saudi Arabia, housing compounds with luxurious amenities, such as swimming pools and tennis courts. They are walled off and provide "some security and privacy from the country's strict Islamic code on matters of dress and social mixing."