Taken from Refdesk.com's Fact of the Day:
You can only see a rainbow when the Sun is shining behind you and it is raining in front of you. Rainbows form when sunlight shines through millions of raindrops. Sunlight is a mixture of colors. When it passes through a raindrop, it is refracted (bent), and the light splits and spreads out into seven colors. All rainbows are part of a circle, but you can usually see only part of it, because the Earth is in the way. If you are lucky, you may see a complete circle rainbow from an aircraft.- Provided by The World Almanac 2012
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