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.
Breakdancing was most popular in the 1980s but continues to be common today. There are four categories in breakdance. They are power moves (windmill, tomas, airtrax and so on), style moves, toprock, downrock (footwork), and freezes (chair, airchair and so on). Many of moves come from gymnastics and kung-fu. Breakdancers dance with breakbeats.