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.
Mechanical Anemometer. Credited with devising the first mechanical anemometer is Italian art architect and mathematician Leon Batista Alberti, in 1450. In his device, the wind pushed against a disk, and an accompanying scale gave a relative strength of the wind as shown by the angle of inclination of the disk.up Anemometer. A more advanced anemometer design using four cups attached by spokes to a central rod was invented by John Thomas Romney Robinson in 1846. Robinson was the director of the Armagh Observatory in Ireland. With his design, cups caught the wind and spun around faster the stronger the wind velocity.