Nicholas A. Robins is a teaching professor of history at North Carolina State University. He is the author of several books, including Mercury, Mining, and Empire: The Human and Ecological Cost of Colonial Silver Mining in the Andes and Of Love and Loathing: Marital Life, Strife, and Intimacy in the Colonial Andes, 1750–1825 (Nebraska, 2015). Barbara J. Fraser is a freelance writer covering environmental, public health, indigenous, and social issues. Her work has appeared in publications including Nature, Science, EcoAmericas, the Lancet, and Discover.