Walter Frederick Morrison three children. Lu died in 1987. There is a disc golf course in Holladay, Utah named in his honor. Morrison died in his home at the age of 90 on February 9, 2010. Walter Frederick Morrison Walter Frederick "Fred" Morrison (January 16, 1920 in Richfield, Utah – February 9, 2010 in Monroe, Utah) was an American inventor and entrepreneur, best known as the inventor of the Frisbee. Morrison claimed that the original idea for a flying disc toy came to him in 1937, while throwing a popcorn can lid with his girlfriend, Lu, whom he later married. The popcorn can
Pluto throughout the 20th century. Astronomers initially calculated its mass based on its presumed effect on Neptune and Uranus. In 1931, Pluto was calculated to be roughly the mass of Earth, with further calculations in 1948 bringing the mass down to roughly that of Mars. In 1976, Dale Cruikshank, Carl Pilcher and David Morrison of the University of Hawaii calculated Pluto's albedo for the first time, finding that it matched that for methane ice; this meant Pluto had to be exceptionally luminous for its size and therefore could not be more than 1 percent the mass of Earth. (Pluto's albedo is