Ishihara plates are a test with a series of circles in which a number is blended in which tests if you are color blind or not. I found this interesting to be because when i was in middle school i was tested and it was shown that i am partial color blind. the link below is a Ishihara plate test that everyone can take a part of.
http://www.youtube.com/watch?v=CZGKRWJIlNE&feature=fvst
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