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It is widely recognized that the capacity of the human brain far exceeds any use to which we put it during our present lifetime, whether we live to 70 years or even 100 years of age. The Encyclopaedia Britannica states that man's brain "is endowed with considerably more potential than is realizable in the course of one person's lifetime." Scientist Carl Sagan states that the human brain could hold more information than "the world's largest libraries." Regarding the capacity of the human brain's "filing system," biochemist Isaac Asimov wrote that it is "perfectly capable of handling any load of learning and memory which the human being is likely to put upon it--and a billion times more than that quantity, too." But why would evolution produce such an excess? "This is, in fact, the only example in existence where a species was provided with an organ that it still has not learned how to use," admitted one scientist. He then asked: "How can this be reconciled with evolution's most fundamental thesis: Natural selection proceeds in small steps, each of which must confer on its bearer a minimal, but nonetheless measurable, advantage?" He added that the human brain's development "remains the most inexplicable aspect of evolution." The evolutionary process would not produce and pass on such excessive never-to-be-used brain capacity.

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