Warm colors, such as red and orange, are believed to cause people to feel hungry. Many fast food restaurants, such as McDonald's, Wendy's and Burger King, use these colors in their logo. Cool colors, such as blue and pur... More »

Red and yellow do make people hungry, according to research results. People eat more when they are surrounded by warm colors, such as yellow, orange and red. Cold colors, such as blue, purple and black, suppress the appe... More »

Mixing red and green together makes the color brown. The three primary colors are red, blue and yellow. Green is formed by mixing blue and yellow, and it is a secondary color. More »

Red and yellow do make people hungry, according to research results. People eat more when they are surrounded by warm colors, such as yellow, orange and red. Cold colors, such as blue, purple and black, suppress the appe... More »

A rainbow is caused by the sun hitting water droplets in the atmosphere and reflecting the light so that people see a spectrum of colors. Rainbows are bowed in the center due to the fact that rainbows result from a group... More »

The generally accepted number of colors of the rainbow is seven, although the rainbow has only six colors to many people, and others claim that the number of colors is infinite. Sir Isaac Newton used prisms to break down... More »

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The human eye is able to see images and colors because of the specialized photoreceptor cells in the retina called rods and cones. The membranes within these receptors contain pigments that undergo chemical changes when ... More »