1. Redheads are harder to sedate than people of other hair color, requiring 20 percent more anesthesia.
2. Red hair is a genetic mutation that emerged about 50,000 years ago in Africa, and the gene for red hair was discovered in 1995.
3. Four hundred years ago, the fat of a red-headed man was a key ingredient in deadly poisons.
4. Although less than 4 percent of the world's population is naturally red-haired, the most popular color of at-home hair dye is red.
5. The highest percentage of natural redheads in the world is in Scotland (13 percent) followed by Ireland (10 percent).
6. Mary Magdalene, Emily Dickinson, and Thomas Jefferson were all redheads.
Special thanks to Marion Roach for sharing these facts about redheads.