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TIL of the St Patrick's Battalion, a unit of the Mexican Army, was composed mainly of Irish Catholic immigrants who deserted the U.S. Army to fight for Mexico, due to sympathy for the Mexican cause based on similarities between the situations in Mexico and Ireland.

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yVBxv TIL Gasoline Has a Surprisingly Short Shelf Life
WkWBd TIL that a giant tortoise species was believed to be extinct for 113 years, only for it to be discovered again in Galápagos, 2019.
mxXWy TIL that oncolytic viruses are a type of virus that preferentially infect and kill cancer cells. A number of such viruses have been tested as potential cancer treatments and one has already been approved in the United States and Europe for the treatment of advanced skin cancer.
R7KO6 TIL Dueling Dino fossil that shows a Triceratops and juvenile T rex battling to death hasn't been available to paleontologists for 13 years after its discovery because of a legal battle between the landowners and the excavation team.
4XrjR TIL about Newgrange, "an exceptionally grand passage tomb built [in Ireland] during the Neolithic period, around 3200 BC, making it older than Stonehenge and the Egyptian pyramids."