""When Charles Darwin entered the world 200 years ago, there was one clear and simple answer to the slave's question. All men were men and brothers, because all were descended from Adam. By the time Darwin had reached adulthood, however, opinions around him were growing more equivocal [...] By the mid-19th-century, many influential voices denied that the enslaved African was a brother, and it was broadly taken for granted that as a man, he was of an inferior sort to his white master"."