PHYSICAL LIMITS. “We reach the final level of complexity, at least at a biological level. We can’t run at 40 mph (although a spurt of c. 23 mph is by no means negligible), nor fly (but a gin and tonic at 38000 feet has its merits), nor swim the Pacific (although the free diving record of 800 feet deserves a salute), but we can out-think any other organism that has ever evolved.”
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