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TIL while the title Archduke was mostly designated to a person greater than a regular duke but less then a king, the original archduke was Otto the Great and was made by combining his titles of 'archbishop' and 'duke' to symbolise his dual roles.

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ejNb TIL palaeontologists found components of red blood cells in a 46-million-year-old fossilised mosquito
1avW7 TIL about Dr Barry Marshall who was convinced that H.pylori bacteria causes stomach ulcers, but no one believed him. Since it was illegal to test his theory on humans, he drank the bacteria himself, developed ulcers within days, treated them with antibiotics and went to win a Nobel prize.
b6rDa Today I learned : Who the Indigenous people of Sicily are.
xgR1 TIL of ‘Tent City’, an Arizona jail built out of old military tents, operational since 1993
W8LB TIL Rutka Laskier, a Jewish girl from Poland who died in Auschwitz at the age of 14, wrote a diary describing her experiences under Nazi occupation. Her diary was published in 2006 and she has become known as the “Polish Anne Frank.”