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TIL of Usama ibn Munqidh, a Syrian poet and diplomat whose life coincided with the First and Second Crusades, and who became acquainted with leaders of the Crusader states, the Knights Templar even clearing their HQ chapel for him to pray towards Mecca.

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epk0n TIL Helike, an Ancient Greek city was submerged after an earthquake and tsunami. It remained underwater in an inland lagoon for centuries before eventually silting over and disappearing. It is thought that it may have been part of the inspiration behind Atlantis. It was only rediscovered in 2001.
KOlVB TIL Genghis Khan maintained a large empire owing to a excellent postal system, where messages were transmitted at a rate of 300 km per day using a network of horse messengers, with every horse station located 40 km apart, similar to a modern day bicycle sharing system.
LQXP0 TIL that the relationship between Jimmy and Charles McGill on Better Call Saul was inspired by prolific cartoonist Robert Crumb’s relationship with his older brother, also called Charles, who became a shut-in due to mental illness. Like Jimmy, Robert’s career was inspired by his brother’s.
wop9J TIL about Pathological Demand Avoidance (PDA), a disorder characterized by extreme, uncontrollable anxiety in the face of anything perceived as a "demand." Those with PDA may try to avoid not only the demands of others, but also the demands of their own body, such as for hunger or sleep.
WkAA8 TIL that in 2004, a woman's steel chastity belt triggered a security alarm at the metal detector. The woman explained that her husband had forced her to wear the device to prevent an extramarital affair while she was on vacation in Greece. She continued her flight to London on the pilot's authority.