Don't remember if the video addresses this (saw it years ago), but aren't most exponentials just part of the ever-present logistic curve? ( http://en.wikipedia.

Don't remember if the video addresses this (saw it years ago), but aren't most exponentials just part of the ever-present logistic curve? ( http://en.wikipedia.org/wiki/Logistic_function http://en.wikipedia.org/wiki/Logistic_function )