Evolutionary psychology, a new science, emerged in the 1990s to focus on explaining human behavior against the backdrop of Darwinian processes. This science considers how the biological forces of genetics and neurotransmissions in the brain influence unconscious strategies and conscious and proposes that these features of biology have developed through evolution processes. In this view, the cognitive programs of the human brain are adaptations. They exist because this behavior in our ancestors enabled them to survive and reproduce these same traits in their descendants, thereby equipping us with solutions to problems that our ancestors faced during our species' evolutionary history. Ethical topics addressed include altruistic behaviors, deceptive or harmful behaviors, an innate sense of fairness or unfairness, feelings of kindness or love, self-sacrifice, feelings related to competitiveness and moral punishment or retribution, and moral "cheating" or hypocrisy.