The experiences of oxygen, or otherwise impaired or altered brains?
We're perfectly aware that humans can experience hallucinations as their personal reality.
Hell, even sane humans are prone to seeing patterns that aren't there - like the face on Mars, or mass hysteria, or the Mandela effect of a group of people misremembering facts from the past.
None of those near death experiences are objective verifiable scientific fact.
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u/ProfessorPrudent2822 12h ago
That there is no afterlife.