off-topic, but his little comment about interstellar travel is wrong. Even with exponential growth in propulsion technology, there is an optimal departure time

off-topic, but his little comment about interstellar travel is wrong. Even with exponential growth in propulsion technology, there is an optimal departure time for arriving earliest. http://en.wikipedia.org/wiki/Wait_Calculation http://en.wikipedia.org/wiki/Wait_Calculation (that equation was published long after this article was written though)