Gray eyes-6 presidents. Brown eyes-4 presidents. Hazel eyes-2 presidents. Black eyes-1 president. The eye situation gets very complicated-we`ll delve into that in a moment-but first let me explain ...

Unlike with green, brown, or blue eyes, grey eyes’ colouration comes from their structure alone (OK, OK, that is pretty cool). That means grey eyes can change colour.

According to a 2020 study, 79% people worldwide have brown eyes, making brown the most common eye color. It may also be one of the oldest eye colors in humans. Around 10,000 years ago, everyone on ...