The unit is named for Heinrich Rudolf Hertz, who was the first to conclusively prove the existence of electromagnetic waves and after the name of Heinrich Hertz and abbreviated as Hz, hertz equals one (0.00000000125) period per second, testing frequencies or the dunes of electrical changes each second.Hertz is often used to calculate the refresh rate of a PC monitor as well as in computer processors.

The range of ultrasound, high-intensity infrasound and several physical vibrations such as molecular vibrations extends into the megahertz range and well beyond. Some of the unit’s most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the speeds at which computers and other electronics are driven.

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The computer mouse as we know it today was invented and developed by Douglas Engelbart, with the assistance of Bill English, during the 1960’s and was patented on November 17, 1970