make your own quantum eraser! fun for the family!

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http://www.sciam.com/article.cfm?chanID=sa006&articleID=DD39218F-E7F2-99DF-39D45DA3DD2602A1&pageNumber=1&catID=2

A Do-It-Yourself Quantum Eraser

Using readily available equipment, you can carry out a home experiment that illustrates one of the weirdest effects in quantum mechanics

BY REMOVING INFORMATION about things that have happened, a quantum eraser seemingly influences past events. In a fanciful example, a cat may have scampered around both sides of a tree at once if information about which way it went is later erased.

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