wikipedia.org

wogvo 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.
9wEXG TIL about the Millennial whoop - no, it's not what you think! - but it is a vocal melodic pattern that especially prevalent in 2010s pop music - one early example of its usage in the new millennium is the song "In the Shadows" by the Finnish band The Rasmus from 2004
4klW5 TIL Swimmer's Itch is considered to be an emerging infectious disease you can get simply swimming in slow-moving rivers, lakes or ponds