The brain oversees daily operations of the body and interprets vast amounts of information. The average adult human brain weighs 1.4 kg (about 3.1 lb), or about 2 percent of total body weight. Despite its relatively small mass, the brain contains about 100 billion neurons. Functioning as a unit, these neurons make up one of the most complex structures on Earth. Scientists have learned a great deal about the brain, but because the brain is so complex, much remains to be discovered.

The brain is responsible for many of the qualities that make each person unique—thoughts, feelings, memories, talents, and emotions. However, much of the brain is dedicated to running the body and maintaining homeostasis.

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