It is perhaps a peculiar quality of human beings that we like to count things, and we seem to become particularly excited when our numbers end up with several zeros at the end. Such is the case with the year 2000, even though it is not exactly the turning of the millennium, which will take place as the year turns from 2000 to 2001. It is close enough, however, and it has its own set of problems, which have been characterized by the expression “Y2K.” I will return to that, but first I would like to offer a few observations to provide perspective on the past as a prologue to our current situation. First, life has existed on Earth for some 4 billion years. Second, humans have existed on Earth for only some 3 million years, less than 1/1000th of the existence of life on Earth. Third, civilization and recorded...