Named after Heinrich Hertz and abbreviated as Hz or illustrated as the f symbol, hertz equals one (0.00000000125) cycle per second, measuring the waves or frequencies of electric changes each second. Hertz is commonly used to measure a computer monitor's refresh rate and in computer processors.
Modern dance. The form of dance style known as modern dance is an artistic dance form that allows free movement based on choreography that seeks to provide the audience with a subject and theme. Modern dance performers created this free form style to allow older dancers to continue to dance long after their ballet dance careers ended.
Main articles: Dance and Concert dance. Martha Graham in 1948. Modern dance is a broad genre of western concert or theatrical dance, primarily arising out of Germany and the United States in the late 19th and early 20th centuries. Modern dance is often considered to have emerged as a rejection of, or rebellion against classical ballet.