Crystal Gayle, American country music singer (source). In humans of Eurasian origin, head hair can grow down to the mid-back and even farther. Long silky hair must have evolved relatively late, certainly no earlier than the last 50,000 years. All of us are born pale, and this infant pallor is striking in otherwise dark-skinned families.... Read More

In the early 20th century there was a rather strange (in hindsight) debate between two groups of biological scientists attempting to understand the basis of inheritance and its relationship to evolutionary processes. The two factions were the biometricians and Mendelians. As indicated by their appellation the Mendelians were partisans of the model of inheritance formulated... Read More