Our happy hour fact to amaze your drinking buddies with.

Every blue-eyed person can be traced back to a shared ancestor.

The first pair of blue eyes appeared between 6,000 and 10,000 years ago as a result of a mutation in the OCA2 gene, which caused a reduction of melanin in one lucky human's iris. A team of researchers analyzed 800 modern-day blue-eyed folk, from Northern Europe to the Middle East, and found that each individual shared a carbon copy of this particular mutated DNA segment.

"We can conclude that all blue-eyed individuals are linked to the same ancestor," said geneticist Hans Eiberg. "They have all inherited the same switch at exactly the same spot in their DNA."

Imagine how much of an outcast that first blue-eyed person probably was. Keeping that in mind, the next time you see a green-haired person, don't immediately assume an attention-grabbing dye job. They could be the future.