The Concept of Anxiety
All of Kierkegaard's books have either a preface, dedication, or prayer at the beginning. This book includes a lengthy introduction. "The Concept of Anxiety" was published on exactly the same date as "Prefaces", June 17, 1844. Both books deal with Hegel’s idea of mediation. Mediation is a common thread throughout Kierkegaard’s works. His work up to this point was to show that faith was being mediated by knowledge. Here he takes up the questions of sin and guilt.
Historical race concepts
The 20th-century criticism of racial anthropology were significantly based on the school of Franz Boas, professor of anthropology at Columbia University from 1899, who beginning in 1920 strongly favoured the influence of social environment over heritability. As a reaction to the rise of Nazi Germany and its prominent espousing of racist ideologies in the 1930s, there was an outpouring of popular works by scientists criticizing the use of race to justify the politics of "superiority" and "inferiority". An influential work in this regard was the publication of "We Europeans: A Survey of "Racial" Problems" by Julian Huxley and A. C. Haddon in 1935, which sought to show that population genetics allowed for only a highly limited definition of race at best. Another popular work during this period, "The Races of Mankind" by Ruth Benedict and Gene Weltfish, argued that though there were some extreme racial differences, they were primarily superficial, and in any case did not justify political action.