Some of your students may spend hours tinkering with this macro-assisted, life-simulating Excel spreadsheet to study and appreciate ecology, and to see how the spreadsheet program achieves complex purposes. The product is best used as an exploration opportunity for single students or pairs of students. Mathematician John Conway’s simple rules for simulating a life form (1970) are the starting point for the spreadsheet. Multiple enhancements let the student create, compare, and contrast up to