With oil and gas supply in a crunch, demand for alternatives has surged over the past two months. Analysts expect wind and solar to explode as countries seek to reduce their dependence on hydrocarbons that are now in short supply. For that to stand a chance of working, however, it needs one more thing: batteries. Cheap batteries. A team of Chinese scientists just announced a breakthrough in that area. The news broke earlier this week, with researchers from the Chinese Academy of Sciences saying they had developed what they called an “all-iron”…

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