Just to annoy George Clooney, Elon Musk believes he can build an electric supersonic jet. From Damon Lavrinc at Wired:

“At the New York Times DealBook conference, Musk said there’s an ‘interesting opportunity to make a supersonic vertical takeoff landing jet,’ something he began to envision after the Concorde service ended nearly a decade ago.

The physics of getting enough power on board an electric aircraft to not only carry passengers, but maintain a supersonic speed, is still decades away. Not that it matters to Musk. Like the Hyperloop, it’s something he doesn’t have time to commit to developing. At least, not yet.”

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In 1968, Braniff predicts the future of air travel:

From a post by Damon Lavrinc at Wired, in which Elon Musk argues vehemently against hydrogen fuel cells for autos:

“There’s an old joke about hydrogen power: It’s the fuel of the future, and always will be. Elon Musk doesn’t just agree, he called out hydrogen fuel cell vehicles as ‘bullshit,’ claiming they’re more of a marketing ploy for automakers than a long-term solution.

The comment from Musk came during a speech to employees and enthusiasts at a new Tesla service center in Germany. The electric automaker’s co-founder and CEO was onstage espousing the virtues of the Model S when he went off on a tangent about EV naysayers: ‘And then they’ll say certain technologies like fuel cell … oh god … fuel cell is so bullshit. Except in a rocket.’

Musk goes on to state that even given the very best hydrogen technology, it doesn’t come close to the energy density of a modern lithium-ion battery pack like that found in the Model S.”

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In 1978, Jack Nicholson invests in hydrogen-powered cars: