** Symmetry**

Symmetrical faces are consistently judged more attractive than unsymmetrical ones. Men with high symmetry typically have more sexual partners, quicker access to romantic partners, and induce more copulatory orgasms.

It should come as no surprise that bodily symmetry is an honest signal of health, genetically as well as physically and mentally. All animals consider symmetry appealing, as it is a cue to the ability to produce robust offspring.

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Symmetry has an aesthetic allure generally. An asymmetric apple may be interesting in a quirky way, but people pick fruit at the supermarket partly based on their symmetry.

Mathematicians are strongly drawn to expressions of mathematical and geometric symmetry. Part of the appeal is that symmetry allows mental heuristics to be applied. Students find math problems that do not use symmetry to be vexingly difficult to solve.

Everywhere we turn we can see symmetrical relationships. They are so pervasive in our daily lives that one is led naturally to wonder if the notion of symmetry is innate in human beings. It is almost as though the notion of symmetry is built into us as a standard against which we measure aesthetic appeal to assess both mental and physical constructs. ~ Israeli science educator Tommy Dreyfus & Israeli mathematician Theodore Eisenberg