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Many thanks to Joyce for sharing yet another engaging and hands-on lesson.  I am actually going to try some of these activities with my own children.  Although we do not study electricity in 7th grade, I had fun learning something new.  Wait, it just SEEMED new...  I  DID study circuits when I crammed for the Science Praxis.  The Praxis certification is a  perfect example of one's ability to conquer a great deal of content without attaching meaning...cramming may have "earned" an excellent score but retention is not achieved.  Learning the way Joyce demonstrated, now that lends itself to long-term retention and meaning .