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TIL that cement and concrete are not the same thing. Cement is only 10-15% of the makeup of concrete and acts to bind the other elements together.

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p8Lvb TIL there used to be so many oysters in the Chesapeake Bay that they piled up almost to the water's surface, causing navigational hazards. Then we harvested them by the millions, and now the population is down by 99.7%. It's one of "the largest documented declines of a marine species"
YpMDZ TIL about Jackie Mitchell, a 17-year-old female pitcher for the Double-AA Chattanooga Lookouts, once played the New York Yankees in an exhibition game and struck out Babe Ruth and Lou Gehrig in succession.
9nRB TIL the Tiananmen Square tank man during 1989 was not actual stopping the tanks to go attack the protesters, the tanks were actually going back to their barracks because the massacre happened the day before.
epROJ TIL that the top 3 causes of death among Gen X'ers are cancer, heart disease, and unintentional injury. Liver disease and diabetes are also in the top 10.
b4AZ TIL before filming Harry Potter and the Prisoner of Azkaban, director Alfonso Cuaron had the three lead actors write an essay about their respective characters. Emma Watson wrote a 16 page essay, Daniel Radcliffe wrote a 1 page summary, and Rupert Grint never turned his in.