Without meaning to, people ape one another. Subtle movements of facial muscles can be measured with an electromyogram (EMG). This mirroring sheds light on a strange fact: couples who are married for a long time begin to resemble each other, and the longer they’ve been married, the stronger the effect. Research suggests this is not simply because they adopt the same clothes or hairstyles, but because they’ve been mirroring each other’s faces for so many years that their patterns of wrinkles start to look the same.
