There isn't an order of magnitude improvement in jet engines in the last 40 years. We're not getting order of magnitude increases. If you really want to change the world, you have to get 1, 2, 3, 4, 5 orders of magnitude increase. I think fundamentally it comes down to energy. When you can actually put a sugar cube in a coffee cup and wrap a fusion reactor around it, then I'm enthusiastic.

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