americanhistory.si.edu

4kwXX TIL U.S. time zones were first adopted in 1883 because railroads needed standardized schedules, using telegraph signals to synchronize clocks & civilian timekeeping followed later.
R5Jwa TIL that Listerine was sold as a surgical disinfectant, a cure for dandruff, a floor cleaner, a hair tonic, a deodorant, and as a "beneficial remedy" for diseases ranging from diphtheria and dysentery to small pox and gonorrhea.
8e5VV TIL that there was a $500 bill available in 1880 as a legal tender. That was almost 150 years ago.