Scientists have analysed some human hair found in Greenland, to find out what the hair's owner looked like.
It's the oldest ever bit of DNA from a human to be found and investigated.
The researchers say the man, who lived 4,000 years ago, had brown eyes and thick dark hair, and they've even given him a name - Inuk - which means human in the language of Greenland.
The experts managed to find out that if he'd grown older, he'd probably have been bald!
Inuk came from an ancient culture of people called the Saqqaq. They lived in a very cold climate and hunted seals and seabirds.
They lived in tiny tents in the winter. Historians don't know why they died out.