Some say that the Drake Equation has too many variables that are impossible to even guess, let alone estimate. For example, here's a great article: http://www.c

Some say that the Drake Equation has too many variables that are impossible to even guess, let alone estimate. For example, here's a great article: http://www.crichton-official.com/speech-alienscauseglobalwarming.html http://www.crichton-official.com/speech-alienscauseglobalwar...