Do great minds think alike? Perhaps, but that wasn't Mike's point when he showed a photo of Albert Einstein during a 2007 speech. The great physicist was once asked to name the greatest force in the universe. Without missing a beat, Einstein replied, "Compound interest!" Mike often uses this anecdote to launch a discussion of rates of growth, pointing out similar compounding trends among such disparate subjects as cancer cells multiplying in a tumor, China's economic expansion, and the increase in the number of officially registered Elvis Presley impersonators.