Interbreeding between archaic and modern humans been shown that Neanderthal ancestry has been selected against in conserved biological pathways, such as RNA processing. Consistent with the hypothesis that purifying selection has reduced Neanderthal contribution in present-day modern human genomes, Upper Paleolithic Eurasian modern humans (such as the Tianyuan modern human) carry more Neanderthal DNA (about 4–5%) than present-day Eurasians modern humans (about 1–2%). Genes affecting keratin were found to have been introgressed from Neanderthals into modern humans (shown in East Asians and Europeans), suggesting that these genes gave a morphological adaptation in skin and hair to modern humans to cope with non-African environments. This is likewise
History of removal of leg and underarm hair in the United States American women aged 15–44 routinely shaved their legs. A century after these ad campaigns started, removal of leg and underarm hair by women in the U.S. is tremendously pervasive and lack of its removal is taboo. An estimated 80%-99% of American women today remove hair from their bodies. Celebrity unshaven armpit appearances started to make headlines. For example, this was the case with actress Julia Roberts who sported unshaven underarms at the Notting Hill movie premiere in 1999. Anne Robinson, a presenter British television show The Weakest Link, received a similar reaction after she revealed underarm hair on air in