Resumen de 50, 100 & 150 years ago.

• The article presents reprints of quotes from issues of the periodical "Scientific American" from 1964, 1914, and 1864, on topics including World War I, housework, and the moons of Jupiter. Information is provided on the population of salmon in the Connecticut River in 1864, the use of sewing machines by homemakers in the U.S., and quantum physics.