1946 - Exploration, Colonization

Exploration, Colonization

Researchers at the California Institute of Technology's Jet Propulsion Laboratories find that a liquid polysulfide polymer is the ideal propellant for rockets: it not only works as a fuel but also bonds directly to the walls of rocket shells, eliminating the need for heavy mechanical supports.

Arctic explorer Robert A. "Bob" Bartlett dies at New York April 28 at age 70.