Living things that have died are normally described as being dead. Death of humans is often investigated for the cause, in case of crime (such as murder), accident or disease that may continue to kill other humans. About 150,000 people die every day around the world. About two thirds of these people die because of age. In addition to the physical body, some believe humans also have a soul and believe that the soul can continue without a body (afterlife), move into another body (reincarnation), or cease to exist (annihilationism). Religions have different beliefs about this issue. Many cultures have their own customs and rituals to respect the dead.