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TIL Water is transparent to the human eye because of evolution. As Brian Skinner wrote: “Water is essentially opaque to all light except a narrow band of wavelengths that happen to correspond to the ones used by our eyes"

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j6w4X Today I learned cockroaches have individual personalities.
WkWdB TIL The unofficial motto of the U.S. Air Force crews serving in America's nuclear missile silos is 'Death Wears Bunny Slippers' because of the tendency for missileers to wear pajamas and Snuggies while on duty.
9Y997 TIL that in the 1940s-60s, Melbourne's Sun Theatre cinema had a pram room, where babies in their prams were placed and given a number. If a baby started crying, its number was flashed on the screen to alert the parents
LkYA0 TIL the fourth wall is called that because it refers to an imaginary “fourth wall” separating audience members from the cast in a theatre
Z86lG TIL there is a blood sport known as Spider Fighting, where two spiders are placed on opposite ends of a stick and pushed towards the middle to fight one another. In 2002, inmates in a Florida prison got into a fight resulting in life threatening injuries over the theft of a pet fighting spider.