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TIL part of Holland can be flooded to keep an invading army out, transforming Holland into an island

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EgxE0 TIL "The Razor and Blades Business Model" is the specific term used to describe a product sold at a low price (or given away) in order to increase sales of a complementary good. For example, low-cost printers that only accept expensive refill cartridges.
xV5Y5 TIL Clara Barton held a clerkship in the US Patent Office with pay equal to that of men. She was the first woman to hold a position or pay of this type in government. Being wrongly fired in 1857 she returned under Lincoln as a copyist to help pave the way for future women's equality in government.
oRd0r TIL that an actress pretended to be Polish her entire life. Olga Petrova spoke with a Polish accent, even in her private life, and said that she was born in Warsaw. She was really Muriel Harding, born in England.
Z8wW4 TIL when The South's Gonna Do It Again by Charlie Daniels Band, a song about Southern rock, was used by the KKK, Daniels said "I'm damn proud of the South, but I sure as hell am not proud of the Ku Klux Klan. [..] It was not written to promote hate groups."
lPjG TIL That the full “Ignorance is bliss” quote by Thomas Gray is “Where ignorance is bliss, ‘tis folly to be wise”