In debates over creationist doctrines, evolutionary biologists often are hard-pressed to explain how nature could make something as intricate as the human brain. Even Alfred Wallace, the 19th century biologist who discovered natural selection with Charles Darwin, could not accept that such a flexible organ of learning and thought could emerge by trial and error.
No two brains are exactly alike, despite their overall anatomical similarity. Each brain changes throughout a lifetime, altered by experience and aging. Even the simplest mental activities, such as watching a moving dot, can involve slightly different areas in different people’s brains, studies show.
Underlying every personal difference in thought, attitude and ability is an astonishing variety of brain cells, scientists have discovered.
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