In the 1950s and 1960s, the Salton Sea resort area was a vacationer's paradise. People looking to go boating, swimming, and fishing flocked to California's largest lake. Homes, hotels, and shops sprang up as more and more people moved to the region. However, something was lurking in the lake's calm waters. Soon, swimmers began to pass by globs of green algae and breathe in a rotten-egg stench. Beachgoers had to step over piles of decaying fish on...