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TIL about fritted glass - a special kind of glass with small opaque dots to ensure birds can see the glass while humans can see straight through it.

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via reddit.com

wLBy1 TIL the famous image of musician Johnny Cash flipping the bird came about as a result of his frustration that a TV crew from the UK filming his performance in San Quentin prison were between him and the audience and wouldn't “clear the stage” upon him asking them to do so...
Z84rR TIL about the dihydrogen monoxide parody, the action of calling water by an unfamiliar chemical name, listing "side effects" which are just scientific terms for harmless water-related bodily processes, and calling for it to be banned. This demonstrates the importance of scientific literacy.
vrbR TIL a family who adopted five children on a bid to get on ‘Extreme Makeover’ kicked the five children out of their home once the makeover was complete
5odr TIL that a gallon of gasoline has 31,000,000 calories.
Wkkld TIL In 2006, The FBI planted an informant pretending to be a radical Muslim in a mosque, and the Muslims in the mosque reported him to the FBI.