Why switching to all-renewable energy requires the world's biggest…

Theoretically, there's easily enough wind and solar energy available to replace the 400 gigawatts of power that are currently provided by fossil fuels. But clouds roll in and winds die down — meaning we can't count on always having enough renewable energy.

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A Battery Made by Bioengineered Viruses

060602_Virus.jpgAll viruses have an organic outer shell, but it turns out that with a little genetic tinkering they can be trained to produce an inorganic outer shell made of gold or cobalt oxide. Angela Belcher's lab at MIT has created an entire factory of trained viruses whose genes have been reprogrammed to grow battery…

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