i gave a lot of time on it but since i few other goals and various issue to solve so i eventually moved on to those just to come back. it sure was worth it, though! however, please note that, in order to span a period of 4 to 5 billion years, the days of creation must have lasted an average of 700 million years each (or periods that long must have occurred between the days). sue and sally are different so they are responding differently to the same exercises. sorry plants, but you just got shown up. 