Color Color Color (American English), or colour (Commonwealth English), is the characteristic of human visual perception described through color "categories", with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of cone cells in the human eye by electromagnetic radiation in the visible spectrum. Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc. By defining a color space, colors can be identified numerically
Judo in the United States Many servicemen picked up martial arts during the war and returned home to teach them all across the country. The official judo federations formed in the 50s and 60s. The United States is not a major power in judo. Judo in the United States There are three main organizations that govern judo in the United States. The United States Judo Federation (USJF) started in 1952. The concentration of the USJF is on the east and west coasts, but also in Chicago and Hawaii. The United States Judo Association (USJA) was founded in 1968 as an extension of the Armed Forces