On the MRI of the brain of a person in love shows that he filed the areas responsible for reward system. This is due to the action of the hormone dopamine, which causes feelings of pleasure. So the brain reacts to a potent narcotic substance – cocaine. In the beginning of the emergence of a sense of the level of dopamine is increased very much, and then drops below normal, this may be depression. Because feelings of love are similar in effect to cocaine, unhappy love can be cured. This is done as in the case of addiction: the life of a person is removed all reminders and incentives, and the empty space is filled with something new, for example, another passion or interesting hobby. Animals that associate themselves lasting relationships, biologists distinguish the stage of desire, passion and affection in their Union. Desire due to the basic needs, fascination is the fixation on a certain object, and through affection in animals there is a strong relationship when they are ready to reproduce and raise offspring for a long time with one individual. Love from a scientific point of view, people like passion in animals. She appeared with the purpose of procreation and helps to save efforts, not to waste their energy, and to achieve only one partner. It is believed that the feeling of love lasts from 1,5 to 3 years, and then it is replaced by affection, mutual respect, a habit. This term gives a guarantee of involvement of the father in the most difficult time raising a child. In some cases, such as unrequited love, separation, strong feelings of love can last longer. No wonder people say love is blind. German scientists have found that people in love are deactivated areas of the brain responsible for rational thinking and negative emotions. The lovers greatly decreases the level of serotonin, off control system. Because of these chemical changes in the body some people go to crime, suicide, so some scientists tend to believe that from accidents of the senses must be medicated. Treatment should be aimed at increasing the amount of serotonin in the body, with this successfully, modern antideressant. To save the fading love can be strong changes in the environment. In response, the brain receives a higher dose all the same of dopamine, so Dating in a romantic setting, couples can save a crumbling relationship. Love from a scientific point of view of representatives of different sexes is very different. The man really loves his eyes, as love increases the activity of those parts of the cerebral cortex responsible for vision. But women love to do with memory, so it remembers the behavior of a partner, analyzes the information and draws conclusions about the possibility of further relationship building.