It's from a video interview with him in 1980: “I read a study that measured the efficiency of locomotion for various species… The condor came in at the top. Hu

It's from a video interview with him in 1980: “I read a study that measured the efficiency of locomotion for various species… The condor came in at the top. Humans came in about a third of the way down. But when a human rides a bicycle, we blow the condor away. That’s what a computer is for me: a bicycle for the mind.”