How Do Rainbows Form?

SciShow explains how three important ingredients -- sunlight, water, and you -- interact to create the illusion of a rainbow. The colorful details are inside!
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Sources:
http://scienceline.ucsb.edu/getkey.ph...
http://science.howstuffworks.com/natu...
http://www.physicsclassroom.com/class...
http://wwwp.cord.edu/faculty/manning/...
http://van.physics.illinois.edu/qa/li...