Your face is the human equivalent of a peacock's tail
The human face is capable of 10,000 expressions, which are vital in our communications with each other. Our expressions reveal our feelings and hide our secrets. On a biological level though, the face is the human equivalent of the peacock’s tail. It’s an advertising hoarding which provides a potential mate with information about health, fertility and appropriateness as a partner. Symmetrical faces and bodies are indications of these attributes, and the face is like a biological code which we can all unconsciously read.
symmetry makes the best athletes
The DNA of any animal is programmed to produce a perfectly symmetrical creature. But many environmental and genetic factors can stop this from happening. Parasites, exposure to extreme temperatures, pollutants and womb conditions - all these things can divert the body from its symmetrical plan. Any creature that survives into adulthood and remains symmetrical is strong and healthy, resistant to the stresses of life. And right across the animal kingdom high quality mates are the most symmetrical ones.
Measuring symmetry
John Manning of Liverpool University has found that middle distance runners with symmetrical nostrils consistently run faster times than their wonky colleagues. He also reports that symmetrical men have higher quality sperm, with fewer deformed ones in the mix. He claims that symmetry is like nature’s black box - it tells you all you need to know about someone’s.
It must be an "attractive" thing.
