This scientific discovery not only sheds light on the origin of blue eyes but also reveals how a small genetic mutation spread across generations, affecting millions of people worldwide.

As much as 80% of the global population is believed to have brown eyes, while only 8 to 10% of people worldwide have blue eyes, 5% have hazel eyes and about 2% of all people have green eyes.

Scientists have said that every blue-eyed person on Earth is able to trace their ancestry to a single individual who lived between 6,000 to 10,000 years ago. They have also worked out that long ...