In 2014, Flint, Michigan, was a cash-strapped city that had been built up, then abandoned by General Motors. As part of a plan to save money, government officials decided that Flint would temporarily switch its water supply from Lake Huron to the Flint River. Within months, many residents broke out in rashes. Then it got worse: Children stopped growing. Some people were hospitalized with mysterious illnesses; others died. Citizens of Flint protested...