I really didn't want to post this, but I am going to anyway. I used ScreenToaster.com to make a screen capture movie (with audio) of a tutorial on spreadsheets.

This should accompany my previous post on numerical calculations.

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Thanks so much for posting this! I am just now teaching my students to do numerical calculations with Excel, and later on we will be moving to vPython. Perfect timing! My students will be watching this for an assignment!