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Today I learned that the original eraser was stale bread and erasers are pink because of pumice: Guide to Erasers

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rZBe TIL Sewol Ferry started sinking in South Korea in 2014, the captain told the passengers, mostly secondary school students, to not move and just stay put. 304 passengers and crew members died in the disaster
4Xkv5 Actually, many species of ducks have feet—and legs!—tinted a bluish green or gray. But for the ducks that do have orange feet, well, it's all about attracting the ladies. Chicks dig orange.
JYNOv TIL that in 2004, Scientology embarked on a top-secret project which involved finding a girlfriend for Tom Cruise.
NXgJM TIL that ethologist John B. Calhoun created "rat utopias" in order to conduct over-population experiments between 1958 and 1962. Ultimately, the experiments ended in societal collapse.
gaNX TIL a platinum weight kept in a French vault that defines a perfect kg keeps experiencing minor fluctuations in mass. Now a perfect crystal sphere that took two years to polish and has a fixed number of atoms is being developed as the new standard