Resumen de 50, 100 & 150 years ago.

• The article discusses reports published in "Scientific American" from 50, 100, and 150 years ago including one on regenerated facial nerves in the November 1959 issue, one on a prize offered by U.S. millionaire John D. Rockefeller to whoever eradicates the hookworm in the November 1909 issue, and one on the discovery of oil in Pennsylvania in the November 1859 issue.