The highest percentage of natural redheads in the world is in Scotland (13%), followed closely by Ireland with 10%. In the US, about 2% of the population are natural redheads.
The country name of Russia means "land of reds" in honor of a redheaded Viking by the name of Rurik.
Archaeological digs in the Chinese desert of Takla Makan found mummified redheads dating back 3,000 years. ( The Han Chinese emperors had redheaded 'magic men.')
Adults have about 120,000 hairs on their head; redheads have fewer, blondes have more, brunettes have the most.
Redheadedness is, genetically speaking, a recessive trait. It may appear after several generations of darker hair.
Redheads don't turn grey. Red hair turned sandy, then white.