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The Periodic Table of Videos Click on an element and see a video about it. They have other videos including one about Viagra though its action is not explicitly described--very well done. I like the traffic light reaction. It uses expensive indigo carmine, but this web site says you can use methylene blue.
These Williamson Kids Can! books are excellent for middle school chemistry exploration. Super Science Concoctions has a newer version as well as the one listed here, though I don't know if they changed the content at all.