Our journey through the California desert continues. We visit the quiet front-runner in the race to extract lithium from the superhot, corrosive brine bubbling underground. And we dive into the past to look at an earlier attempt to harvest lithium from the Salton Sea. That project ended in failure, but its patents live on. And those patents could be a roadblock for the companies racing to extract the “white gold” today. With millions of dollars invested and a global supply of lithium waiting below the Salton Sea, there is a lot on the line.