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TIL During the 9th century AD, two Vikings graffitied their names in the runes of Hagia Sophia. These carvings have survived since the Byzantium era, and are still viewable in modern-day Istanbul.

X0G8E Today I learned example.com is a reserved domain owned by IANA , created in 1999 (RFC 2606). The domain was set aside to provide an example name that doesn’t conflict with real domains. It can’t be sold or transferred and is a globally recognized placeholder for tutorials.
j95R TIL a one of a kind sulphur based ecosystem exists in a Romanian cave completely sealed off from the rest of the world
W7vl8 TIL: There was a drinking game in Ancient China with referee officials and a "registrar of rules" to maintain order and issue penalties. If a guest is considered a "coward" for dropping out, they would be branded as a "deserter" and not be invited back in the future.
QJAKa TIL the "Doctor" title was appropriated by physicians, who took it FROM academia. History has dictated the use of the courtesy title Dr by physicians and general practitioners. However, surgeons do not use the title of Dr and, due to the origins of surgery with the barber surgeons.
J1Xak TIL that until 1970, Royal Navy sailors were given daily rum rations - a tradition dating back to the 17th century to make life at sea bearable. On the final day before it was abolished, many unhappy sailors held mock funeral processions, drank their final rations and threw the rest overboard.