Depending on your situation and your needs, you might or might not find some of the currently available human modification or enhancement options useful. Some of these are commonplace – exercise, healthy diet, relaxation techniques, time management, study skills, information technology, coffee or tea (as stimulants), education, and nutritional supplements (such as vitamins, minerals, fatty acids, or hormones). Others you might not have thought of, such as getting a cryonic suspension contract (see “What is cryonics? Isn’t the probability of success too small?” ), or chewing nicotine gum for its nootropic effects. Still others – for instance pharmacological mood drugs or sex reassignment surgery – are suitable only for people who have special difficulties or needs.