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    Why You Should Put YOUR MASK On First (My Brain Without Oxygen) - Smarter Every Day 157

    SmarterEveryDay

    5 HN recommenders · recommended in 12 months, 2016–2025

    YouTube

    10:18 · 12M views · Jul 22, 2016

    Destin Sandlin of Smarter Every Day undergoes hypoxia training and experiences his own impaired thinking as oxygen is withdrawn. The video shows how quickly and unnoticeably oxygen deprivation degrades judgment, illustrating why you put your own mask on first.

    It is the go-to demonstration of how hypoxia silently disables decision making, cited in threads on altitude, flying, diving, CO2 and breathwork.

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    13 comments from Hacker News

    1. @j_bumApr 2025· in “Decreased CO2 during breathwork: emergence of altered states of consciousness”

      Destin from Smarter Every Day (YouTube) has a wonderful video demonstrating this effect [0]. I’d recommend watching the whole thing, but you can see how much of an effect it has starting around the 6:00 mark. [0] this video

      Strongly recommendsView on HN
    2. @sithadminJan 2022· in “The strangely successful history of people mailing themselves in boxes (2015)”

      30-40k ft is absolutely a problem. Even if you remain conscious, you're completely unable to think coherently and generally have no idea what you're doing. Stay there long enough and you will unquestionably suffer brain damage and probably death as well. SmarterEveryDay did a good video about hypoxia training that demonstrates the very rapid onset and severe effects of hypoxia at cruising altitudes: this video

      RecommendsView on HN
    3. @glandiumSep 2017· in “How flying messes with the mind”

      This Smarter Every Day video demonstrates how dumb you can get under (less mild) hypoxia (and why it's important to take care of your own oxygen mask before others') this video

      RecommendsView on HN
    4. @mikejbJan 2019· in “Why is cognitive function impaired at high altitude?”

      Destin from the 'Smarter Every day' YouTube channel did something similar (in a PSA-sort of style), and it's partly funny, partly scary to watch: this video

      RecommendsView on HN
    5. @JshWrightJul 2017· in “Two days in an underwater cave running out of oxygen”

      To take this tangent even further afield... Here's an actual real life demonstration of why you should put your oxygen mask on first: this video

      RecommendsView on HN