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Captain America  is a fictional  superhero  appearing in  American comic books  published by  Marvel Comics . Created by  cartoonists   Joe Simon  and  Jack Kirby , the character  first appeared  in  Captain America Comics  #1 ( cover dated  March 1941) from  Timely Comics , a predecessor of Marvel Comics. Captain America was designed as a  patriotic   supersoldier  who often fought the  Axis powers  of  World War II  and was Timely Comics' most popular character during the wartime period. The popularity of superheroes waned following the war and the  Captain America  comic book was discontinued in 1950, with a short-lived revival in 1953. Since Marvel Comics revived the character in 1964, Captain America has remained in publication. Captain America wears a costume that bears an  American flag   motif , and is armed with a  nearly indestructible shield  that he  throws at foes . The character is usually depicted as the  alter ego  of  Steve Rogers , a

Blue  is the  colour  between  violet  and  green  on the  optical spectrum  of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres. Blues with a higher frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency and a longer wavelength gradually appear more green. Pure blue, in the middle, has a wavelength of 470 nanometres. In painting and traditional  colour theory , blue is one of the three  primary colours  of pigments, along with red and yellow, which can be mixed to form a wide  gamut  of colours. Red and blue mixed together form violet, blue and yellow together form green. Blue is also a primary colour in the  RGB colour model , used to create all the colours on the screen of a television or computer monitor.