Resumen de 50, 100 & 150 years ago.

• The article discusses various reports published within "Scientific American" between 1860 and 1960 including one from the August 1960 issue about research by scientists at the U.S. National Aeronautics and Space Administration (NASA) on vertical takeoff and landing (VTOL) aircraft, one from August 1910 about the influence of forests on stream-flow, and one from August 1860 about Minot's Ledge lighthouse.