MIT researchers have figured out how to make solar cells with old car batteries

Here's a clever technological breakthrough that could help the environment in two ways. MIT announced this week that some of its researchers have figured out a way to make solar cells using parts from discarded car batteries that would otherwise have simply gone to waste. Essentially, the researchers have figured out how to extract lead from old car batteries and use it as a component in solar cells that they say are just as efficient as solar cells produced with "high-purity, commercially avail...