Automakers, industries, and governments are betting on hydrogen again. Will it work this time? 

Between the battery electrics, plug-in hybrids, and radar-festooned self-driving cars on the streets here in San Francisco, the slick red Toyota Mirai doesn’t turn many heads.

That’s despite it being one of the most technologically advanced cars in the world and one of the rarest. Since it went on sale in 2015, Toyota has sold only about 10,000 of the sedans in the United States (out of a total of approximately 290 million registered cars in the country). Yet it easily blends in with traffic.

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