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traches, to news in Alabama seeks to execute prisoner using nitrogen gas asphyxiation

Your “I need to breathe” reflex is driven by the presence of CO2, not by the absence of oxygen. A lack of oxygen makes you euphoric, then you get tunnel vision, and then you pass out. This is why it’s dangerous to hyperventilate before free diving - you clear out the CO2 from your blood but don’t really add more oxygen. Instead of coming up for air when you need it, you might just pass out instead.

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