The brain poses many more than just the five quandaries we've highlighted on these pages. Delve into any one of them and you'll soon run into another. Remembering the past (p. 30), for example, is a significant part of human experience, which raises one of the slipperiest questions in all of science: What is the biological basis of consciousness? (See Science, 1 July 2005, p. 79.) The elusive nature of that problem has convinced some researchers to stick to memory.
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