Fun Facts. 1  Table tennis has been an Olympic sport since 1988. 2  In professional table-tennis volleys, the ball can reach speeds as high as 90 miles per hour. 3  Table tennis is the national sport of China.  Table tennis is the second most played sport in the world, behind soccer.
The Borg Scale is a method to measure a personâs perceived exertion rate. Developed by Stockholm University professor Gunnar Borg during the 1980s, the scale does not require any equipment, but asks participants who engage in physical activity to assess his or her perceived rate of exertion from light to strenuous. The scale measures exertion in a range between six and 20.
Gyroscope Compass: History of Sperry Marine. Biographies on inventor Elmer Sperry and the history of gyroscope compasses. Elmer Sperry-Sperry Gyroscope. Elmer Sperry invented the gyroscopic compass or Sperry Gyroscope.Elmer Ambrose Sperry. Elmer Sperry invented gyroscope guided automatic pilots for ships, airplanes, and spacecraft. year earlier (1851) Leon Foucault invented the Foucault pendulum which he used to measure the Earth's rotation. Among his other achievements: in 1850, Foucault proved that light traveled more slowly in water than in air; and in 1858 Foucault made an improvement to the mirrors used in reflecting telescopes.