Look at the crown of your head, and you will probably find a small spiral where your hair seems to grow in a particular direction. For most people, it is easy to ignore. But what if the direction of that tiny swirl is influenced by where you were born?
That was the surprisingly specific question researchers from France and Chile investigated in a study of human hair whorls. They wanted to know whether the hair on people's heads in the Northern Hemisphere tends to swirl in the same direction as in the Southern Hemisphere, or whether the two populations show different patterns.
