The Exponential Function

Youtube was made for this kind of stuff. Dr. By Dr. Albert A. Bartlett,
Professor Emeritus in the Department Of Physics at the University of Colorado At Boulder, speaking on the exponential function which basically stipulates that at 7% growth a number will double within 10 years. This applies to population growth, economic growth, energy use, etc.

The talk, entitled Arithmetic Population & Energy, is riveting for what it is - a classroom lecture with little in the way of pyrotechnics or dancing hamsters... although the tie is pretty awesome.