From Bulldogs to Beagles, almost all dog breeds have eyes of varying shades of brown. However, a small handful carry the elusive genetic trait that enables green eyes.

Why do we find jealousy so painful to admit to? And is envy really a more deadly sin? In this extract from his new book, Peter Toohey explores the meaning and history of the green-eyed monster ...

If your eyes are green with a black limbal ring, you are agile and smart. You think on your feet and make great decisions under pressure. Problem-solving and adaptability are your strong suits.

There's something about green eyes that we can't help but be fascinated by. Maybe it's the fact that they're rare, or maybe it's just that they stand out more, but studies have found that we find ...