This is what all blue-eyed people have in common.

Apart from their blue eyes, all blue-eyed people have one feature. It is the world’s second most popular eye color, with origins believed to be between 6,000 and 10,000 years ago. The widespread iris coloration appears to be the product of a genetic mutation, as all people were born with brown eyes of varied shades. There are many more intriguing facts about blue-eyed people.

For example, they are more sensitive to light; having more melanin in the iris means having more protection in the back of the eye from UV radiation and blue light damage, according to Auckland Eye. People with blue eyes have less melanin than other colors, hence photophobia (abnormal sensitivity to light) is more prevalent.While this may seem negative, there are various advantages to having blue eyes.

According to the Daily Mail, a study conducted by Louisville University professor Joanna Rowe found that people with this eye color are more likely to be good strategic thinkers. The lecturer adds, “It is simply observed rather than explained.” “There is no scientific answer yet.” Many notable persons with blue eyes have excellent minds, like Stephen Hawking, Alexander Fleming, and Marie Curie.