Female and male bush spirits, Côte d’Ivoire The polygyny rate varies considerably among human populations, being highest (20 to 40% of all sexual unions) in the agricultural societies of sub-Saharan Africa and Papua-New Guinea. Such high rates have consequences. The average man will have to wait for a wife until well into adulthood. The average... Read More

Since the mid-20th century, ‘skin bleaching’ has become more and more common among dark-skinned populations. It involves lightening skin color by means of topical preparations that contain hydroquinone, cortisone, or mercury. These products are effective, but prolonged use may damage the skin by making the epidermis thinner and by breaking down collagen fibers. Despite being... Read More