In a seemingly paradoxical study, US researchers found that redheads have a preternaturally high pain tolerance — wait for it — due to a mechanism that ups their susceptibility to sunburns. “These findings describe the mechanistic basis behind earlier evidence suggesting varied pain thresholds in different pigmentation backgrounds,” said Dr. David Fisher of the Massachusetts General Hospital in Massachusetts. He led the fiery study published in the journal Science Advances. The research found that the cells that determine skin color — called melanocytes — play a large role in deciding how people experience pain.