"I realized that a methane-oxygen rocket engine could achieve a specific impulse greater than 380."

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[Nikola Tesla] would do it through lucid dreaming. He would, in a sense, dream up the engine, forget about it, come back, and then discover where it was wearing. You know, where the parts were wearing out. Now, that's inner visualization and a half! And that was the secret of why he did so many inventions.

— Paul Laffoley