saga
The air that you normally breathe is 20.9% oxygen (the rest is mainly nitrogen). ... It's not that breathing a more oxygen-rich mixture will harm us (although after six hours, pure oxygen does become toxic for healthy people
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saggara o.7
saga
The air that you normally breathe is 20.9% oxygen (the rest is mainly nitrogen). ... It's not that breathing a more oxygen-rich mixture will harm us (although after six hours, pure oxygen does become toxic for healthy people