BBC, November 14, 2017
It was one of the worst water contamination scandals in recent US history. In 2015 children living in Flint, Michigan, began suffering from rashes and mysterious illnesses.
Independent testing found dangerous levels of lead in homes and schools, caused by chemicals in the water supply that corroded the pipes.
Officials declared an emergency and residents were told to stop using tap water. They were given free bottled water and filters, but Eric Roy, a chemist living in Washington DC, didn’t think regular filters would be capable of dealing with such high levels of lead.