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TIL Emerson Romero was a silent film actor who was deaf. When movies with sound were invented, deaf actors got less roles and the intertitle text was removed. This led him to make an early form of movie captioning in 1947 so that movies would still be accessible to deaf people.

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6EmdW TIL that information about Earth's magnetic field such as intensity and direction are stored in certain minerals present in sedimentary rock. Using the data present in different layers of rock, scientists are planning to reconstruct the advancement of this magnetic field over time.
Yp6O7 TIL you should never wash a cast iron pan with soap because it can strip off the oil you've baked and cooked into the dish. Also, when you first get a cast iron, you need to "season" it by baking oil into it and each time you use it, the layers of oil and flavor will build.
JYJMQ TIL 2 Things: "Master Putter-Togetherer" is an actual job title...and they put together REALLY expensive, high-quality scissors
6E5o8 TIL Cornelius Vanderbilt was the richest man in the world with net worth of US $215 billion (inflation-adjusted 2016). In comparison Jeff Bezos's net worth is US$137 billion (January 2019). By a 1973 family reunion, not one of the 120 Vanderbilt descendants present was a millionaire.
5wPp TIL The blood on set for Sweeney Todd was coloured orange so it rendered correctly on the desaturated color film used.