"A few years ago, I read a study about the efficiency of locomotion for various species on the earth, including man. The study determined whcih species was the most efficient, in terms of getting from point A to point B with the least amount of energy exerted. The condor won. Man made a rather unimpressive showing about a third fo the way down the list.
But someone there had the insight to test a man riding a bicycle. Man was twice as efficient as the condor! This illustrated man's ability as a tool maker. When he created the bicycle, he created a tool that amplified an inherent ability. That's why I like to compare the personal computer to the bicycle. Our personal computer is a 21st century bicycle if you will, because it is a tool that can amplify a certain part of our inherent intelligence."
Steve Jobs - co-founder of Apple Computer