Professor Homunculus found these sites interesting. They do not concern Math Mojo or its methods, but they have information which can help fill out your mathematical knowledge and thinking skills.

I take no responsibility for their content, but I have checked them out and have found nothing offensive on any of them. Just good information.

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About the Abacus or Abax

abacus.ca - A computer and internet firm, which has a page about the history of the abacus and some pictures of abacii.

ee.ryerson.ca A very comprehensive site about the abacus. You will find and interactive java-applet of an abacus there, and lessons on how to use it. Also lots of history, and a wonderful cautionary tale at the link "Feynman vrs. the Abacus" which explains the danger of using it as a crutch (much like people use calculators).

 

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Puzzles

mathmojo.com/kenken - Lessons on how to solve Kenken puzzles. Detailed video lessons from simple to very advanced kenken.

http://www.puzzlexpress.com/Links.htm A very good source of all kinds of puzzles, from crosswords, to sudoku and kenken and more.