"Why did you choose to stay here?" (...) "I don't know," he said. "It's as if there's more oxygen here."

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You don't see the plug connected to the environment, so it looks like we're free, wandering around.  Take the oxygen away, we all die immediately.  Take plant life away, we die.  And without the sun, all the plants die.  So we are connected.

— Jacque Fresco