Evolutionary psychology is a very intriguing topic. It helps us answer questions like why do we value what we value, why do we have the preferences we have? How can we explain the desires we have in life? The field of evolutionary psychology can be greatly attributed to the work of Charles Darwin. Evolutionary psychology can be defined as an approach to psychology that is used to interpret the useful mental and psychological traits like memory, perception, or language as adaptations, the functional products of natural selection. In short, it is focused on how evolution shapes the mind and behavior. Although evolutionary psychology can be applied to any living organism with a nervous system, today it largely focuses on evolution’s impact on human behavior. Scientists like to believe that we understand the reasons why animals make certain decisions, why they choose to live in certain places, why they eat what they eat, why they pick the certain mate they have, but the same rationale can apply to humans. Humans are driven by desires, emotions, and preferences that we have that we can not necessarily explain consciously. Using evolutionary psychology we can find answers to these questions. We always struggle to explain the true rationale behind our behavior because we fail to consider our evolutionary history. In the 1870s, Charles Darwin theorized that emotions evolved because they had value in adaptation. His theory argues that all living species arrived at their current biological form through a historical process involving random inheritable changes called survival of the fittest. Some changes are adaptive; they increase an individual’s chances of surviving or reproducing. For example, fear emerged because it helped people to act in ways that boosted their chances of survival. Darwin also hypothesized that facial expressions are developed in order to allow others to quickly make a judgement of someone’s hostility or friendliness, helping us to communicate our intentions to others. Evolutionary theorists believe that all human share several emotions, including happiness, contempt, surprise, disgust, anger, fear, and sadness, and that all other emotions are simply different magnifications of these main emotions. Evolutionary theorists tend to deemphasize the impact of thought and learning on emotion, but they do agree that it has an effect.