The mathematical concept of symmetry has many applications, such as in chemistry and biology. Symmetry has been thought for some time to be an important indicator of good health and survival prospects - even for humans. People with more symmetric faces are more generally found attractive, and so have a better chance of success in reproduction and genetic survival. Also, severe asymmetry can indicate genetic problems, or that the individual suffered from infections that affected its development - suggesting to potential mates that they should look elsewhere.