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The original was posted on /r/todayilearned by /u/FearMyCock on 2025-07-17 03:22:36+00:00.

Original Title: TIL about “wet bulb temperature” a combination of heat and humidity so extreme that if it reaches around 35°C (95°F), even fit, healthy individuals resting in the shade with unlimited water can no longer cool down by sweating. Death can occur within hours.