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TIL calculus is another word for tartar (hardened dental plaque).

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LkovQ TIL in 1924, a Russian scientist started blood transfusion experiments, hoping to achieve eternal youth. After 11 blood transfusions, he claimed he had improved his eyesight and stopped balding. He died after a transfusion with a student suffering from malaria and TB (The student fully recovered).
EY4d TIL The Cheesecake Factory’s Bistro Shrimp Pasta has 3,120 calories and 89 grams of saturated fat and 1,090 milligrams of sodium. This is 150% of the daily recommended caloric intake for the average adult, in one meal.
N4nP TIL U.S. radio host Jerry Klein produced a show where he called for all U.S. Muslims to get tattoos and marks on their IDs which identify them as Muslims. Many listeners expressed support. At the show’s end, he revealed it was a hoax highlighting the dangers of extremism.
1a7G7 TIL that the Soviets used mobile gas chamber vans to execute groups of counter-revolutionaries during The Great Purge of the 1930's
J1JL4 TIL that the Hoover Dam contains enough concrete to build a two-lane road from San Francisco to New York.