See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. They say the eyes are "the window to the soul" and there's certainly ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Blue eyes look like a simple inherited trait, one of many colors scattered across the human population. Genetics tells a stranger story. The evidence points to blue eyes originating not gradually ...

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture. Tom has a Master's degree in Journalism. His editorial work ...

You may remember the story of Mendel and his pea plants or predicting the colour of a rat’s coat of hair. A popular (but ...

You’re introduced to someone and your attention catches on their eyes. They might be a rich, earthy brown, a pale blue, or the rare green that shifts with every flicker of light. Eyes have a way of ...

Our remote ancestors likely had dark eyes, whether brown or black. Blue eyes are common in northern Europe and likely emerged some 5,000 years ago. This suggests that genetic evolution can be more ...