2. Because of continued research, we have refined our understanding of the physical properties of the human brain.
1. The brain weighs approximately three pounds.
2. The brain is made up of fifteen billion nerve cells.
3. The cortex of the brain is one-quarter inch thick.
4. The central fissure is a deep groove that runs down the center of the brain from front to back.
4. What prevents some people from sharing their feelings with others?
1. Expressing their feelings may bring up a great deal of anxiety.
2. Many people don't recognize the feeling when they occur.
3. Some people have learned that certain emotions are acceptable while others are not.
4. Some people feel that they don't want to burden others with their problems.