I got Hexcodle #348 in 4! Score: 67%

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I’m with you on tiramisu. If I could only have one dessert for the rest of my life, that would be it!

The human body can only detect a buildup of carbon dioxide in the lungs, not a lack of oxygen. This is why it’s uncomfortable to hold your breath for a long time. If you inhale pure nitrogen while being able to exhale, there is no build up of CO2 and therefore little to no discomfort.

Wikipedia cites a USAF text, saying: “Some individuals experience headache, dizziness, fatigue, nausea and euphoria, and some become unconscious without warning.”