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TIL the only animal considered to display true tripedalism (moving using 3 limbs) is the parrot. Specifically, their head is considered their third limb while climbing

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Yvgx TIL when Catholics were persecuted in England in the 1500s, priests holding secret masses would hide from search parties in “priest holes,” secret chambers within the house. As searches could last week, sometimes the priests starved or asphyxiated.
WnvB TIL About 600,000 Horseshoe Crabs are caught each year to have their blood harvested to test medicines and medical devices for endotoxins like E. coli. This is a concern as they’re now classified as “Vulnerable” and currently create the only substance able to detect these types of bacteria.
69pbm TIL that Tudor England strictly regulated begging. Healthy beggars would be whipped or branded with a "V." Only the sick or weak were allowed to beg—and only in assigned areas. If caught begging elsewhere, they were punished.
N4ee TIL the way Dr. Seuss pronounced his name was that it rhymed with “voice”
XE1gr TIL that the song "House of the Rising Sun," most famously known from the recording by The Animals in 1964, is actually a much older traditional folk song with no known original artist, composer or place of origin.