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With its billions of cells linked by trillions of connections, the human brain is the most complex thing in the universe. Within weeks of conception, fetal brain cells develop at the rate of 500,000 per minute. From birth to age one an infant's brain is most easily molded by external influences and experiences. The first hour of "The Baby's Brain," volume one in a series on The Secret Life of the Brain, focuses on the formation of the infant brain, examining such factors as brain organization and the roles of genetics and environment on brain development.