... I said about limiting factors. Well, there's one that you can't beat. Put steel under fifty thousand pounds per square inch pressure and it starts to flow. The metal used in this machine must have been able to withstand much greater pressure, but there was a limit beyond which it was not safe to go. At twenty miles above the planet's surface, they had reached that limit. They had reached dead end. (Clifford D. Simak)

... I said about limiting factors. Well, there's one that you can't beat. Put steel under fifty thousand pounds per square inch pressure and it starts to flow. The metal used in this machine must have been able to withstand much greater pressure, but there was a limit beyond which it was not safe to go. At twenty miles above the planet's surface, they had reached that limit. They had reached dead end.

Clifford D. Simak

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