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I like to read a bit more about any topic - so I am more likely to have an answer to questions that might come up. That's why I try to include extra references to books and other websites throughout so that you can do the same.
Abacus example: While I doubt I will ever help children make an abacus out of O-shaped cereal, if I did I would want to practice using an abacus, read about abacus math, and learn the difference between a Chinese and Japanese abacus before I went into the classroom. If you go that route, you may want to skim something like these abacus pages:
Abacus Museum
PBS's mathline on abacus
(I could see having them make one out of beads instead of cereal.)
Last updated: January 2009