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Percentage of the world’s population with red hair. Yesterday, November 5, was National Redhead Day, and the WineSpeed editorial staff extends belated best wishes to our fiery-tressed boss, Karen! Australia, Ireland, Italy, the Netherlands and the U.K. all celebrate their Carrot Tops on similar days across the calendar year. Most often the result of scoring the mutated MC1R gene on Chromosome 16 from parents, red hair appears naturally across all ethnicities and people of color.