People who laugh often have other physical advantages as well. They tend to have lower blood pressure and lower stress levels. They tend to get sick less often because laughter has been shown to increase infection-fighting antibodies. This has led many hospitals to create programs designed to make patients laugh. For example, it is quite common to see a red-nosed clown joking with young patients in the pediatric ward. Hundreds of hospitals also provide patients with "humor carts," loaded with humorous CDs, DVDs, cartoon books, and funny props.