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TIL that Captain Oates an Antarctic explorer died during the Terra Nova Expedition. Oates struggling with the journey back walked from his tent into a blizzard. He committed suicide in an act of self-sacrifice when his ill health was compromising his three companions' chances of survival.

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OoZVg TIL in the Ancient Roman Empire, there were 24 hours in the day. The 24 hours were divided into equal parts 12-Light hours and 12-Dark hours. Therefore the length of an hour would change based on the seasons.
P1Y9V TIL modern mathematical notation for fractions that seperates the numerators and denominators with bars were invented by the 12th century Moroccan mathematican Abu bakr Al hassar
njeB TIL that the United States has attacked or “intervened” officially in 145 countries since 1890. It has also been alleged that over 40 assassination attempts have been attempted or completed to initiate regime change favorable to the USA (source in comments).
D15vY TIL the only 2 patients to be cured of HIV were also undergoing cancer treatment at the same time; meaning they became cancer free AND HIV negative at the same time
WaGA TIL the oldest cave paintings in the world are in the Chauvet-Pont d’Arc, France. Scientists originally thought they were 20,000 years old, but discovered they were 35,000 years old after further inspection