What the Eyes Don't See: A Story of Crisis, Resistance, and Hope in an American City (One World Essentials)

by Mona Hanna-Attisha

The entire concept of “unleaded” is a misnomer, in fact. Lead was mined from the earth and added to gasoline. The reason? To stop engine knocking, an annoying noise in early car engines that occurred when the mix of fuel and air burned unevenly.