Resumen de 50, 100 & 150 Years Ago.

• Presents articles published in past issues of "Scientific American" some of which date back to 1854. George Gamow on the big bang theory; Charles Darwin's examination of coral reefs; Polar expeditions of Luigi Amedeo of Savoy in 1904; Comments on the opening lecture of the Royal Institute of London by Michael Faraday in 1854.