8 Ways Having Red Hair Affects A Person's Health, From Pain To Sex
https://www.medicaldaily.com/8-ways-having-red-hair-affects-persons-health-pain-sex-348198Ancient DNA and Neanderthals | The Smithsonian Institution's Human Origins Program
https://humanorigins.si.edu/evidence/genetics/ancient-dna-and-neanderthals/dna-genotypes-and-phenotypes