Is the developed world we've created giving us cancer?

By Chelsey Kivland, Professor of Anthropology, Dartmouth College. Scientists know that many toxins, such as those found in cigarettes, cause most lung cancers, whose cells are depicted here. But isolating causes for other cancers is an ongoing effort. Raj Creationzs/Shutterstock I had assumed that the small lump in my breast was a blocked milk duct from…