MDMA (ecstasy) is a recreational psychoactive substance, the effects of which can include openness, feelings of euphoria, easier contact with strangers, deeper sensations of various stimuli or a change in the sense of time passing. Various researchers are particularly interested in one of MDMA's actions - facilitating contact with other people. Recently, specialists from New York and California carried out a rather interesting study on mice, in which they examined how administering MDMA to animals affected their relationships with other rodents.