Quote: Louis Leakey and the destruction of mankind

From the Popular Science archive, June 1963 (p. 24):

Too much specialization?
Man--like the giraffe--may have stuck his neck out too far, says British anthropologist Louis S. B. Leakey. The threat is extinction.
...
Leakey contends that man's hands and brains are also instruments of overspecialization--creating the tools of self-destruction. But he adds that one specialized trait--intelligence--could also save him.