Humor therapy (sometimes called therapeutic humor) uses the power of smiles and laughter to aid healing. Humor therapy helps people find ways to make themselves and others smile and laugh more. When thinking of humor therapy, picture clowns in the children's ward of a hospital cheering up sick children. Many therapists have learned the value of providing a good laugh to those they care for. Scientists have been researching the relation between the mind and the body, especially in connection with the body's ability to heal (a field called psychoneuroimmunology). Laughter appears to change brain chemistry and may boost the immune system. Humor may allow a person to feel in control of a situation and make it seem more manageable. It allows people to release fears, anger, and stress, all of which can harm the body over time. Humor improves the quality of life.