nature of race." Gissis (2008) examined several important American and British journals in genetics, epidemiology and medicine for their content during the 1946–2003 period. He wrote that "Based upon my findings I argue that the category of race only seemingly disappeared from scientific discourse after World War II and has had a fluctuating yet continuous use during the time span from 1946 to 2003, and has even become more pronounced from the early 1970s on". 33 health services researchers from differing geographic regions were interviewed in a 2008 study. The researchers recognized the problems with racial and ethnic variables but the majority still believed these variables were necessary and useful. A 2010 examination of 18 widely used English anatomy textbooks found that they all represented human biological variation in superficial and outdated ways, many of them making use of the race concept in ways that were current in 1950s anthropology. The authors recommended that anatomical education should describe human anatomical variation in more detail and rely on newer research that demonstrates the inadequacies of simple racial typologies. A 2021 study that examined over 11,000 papers from 1949 to 2018 in The American Journal of Human Genetics, found that "race" was used in only 5% of papers published in the last decade, down from 22% in the first. Together with an increase in use of the terms "ethnicity," "ancestry," and location-based terms, it suggests that human geneticists have mostly abandoned the term "race." Sociology Lester Frank Ward (1841–1913), considered to be one of the founders of American sociology, rejected notions that there were fundamental differences that distinguished one race from another, although he acknowledged that social conditions differed dramatically by race. At the turn of the 20th century, sociologists viewed the concept of race in ways that were shaped by the scientific racism of the 19th and early 20th centuries. Many sociologists focused on African Americans, called Negroes at that time, and claimed that they were inferior to whites. White sociologist Charlotte Perkins Gilman (1860–1935), for example, used biological arguments to claim the inferiority of African Americans. American sociologist Charles H. Cooley (1864–1929) theorized that differences among races were "natural," and that biological differences result in differences in intellectual abilities Edward Alsworth Ross (1866–1951), also an important figure in the founding of American sociology, and a eugenicist, believed that whites were the superior race, and that there were essential differences in