The heart is a very old symbol of love that is used by everyone all over the world. Traditionally, in several cultures the heart has been chosen as the seat of love and feeling. It is not entirely clear why the heart was chosen as a love symbol. Perhaps because the heart is automatically related to the (emotional) life and without the heart (read love) no life is possible. The heart rate is partly influenced by feelings; our heart beats faster when we are in love. The heart likes to be loved. The heart needs love. It is even claimed that love extends life expectancy, while loneliness has the opposite effect. Everyone knows the expression: "He died of a broken heart".