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TIL in Pompeii around 2000 years ago, “Beware Of The Dog” mosaics were used near the entrances to houses, much like modern day signs serving the same purpose.

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rRwK0 TIL that when recording "Heroes", David Bowie used three microphones. One 9 inches away, one 20 feet away, and one just beyond that. Each microphone was muted as the next activated, forcing him to sing at increasing volume to be heard.
6EMdQ TIL that even though Berkeley had one of the best rugby teams in the US that won many national championships, the university wanted to get rid of the team in 2010 in order to reduce costs. Only after a ton of fundraising was the sport kept.
oBG6W TIL NASA scientists have confirmed there is water on the surface of the moon. Researchers previously found evidence of hydration on the surface, but it was unclear whether that hydrogen was in the form of hydroxyl – the chemical for drain cleaners – or in the form of H2O, or water.
awoN9 TIL Astronaut Jim Lovell was asked if he would go on another spaceflight after an explosion almost killed the crew of Apollo 13 on its way to the Moon. Lovell was about to say yes. Then he saw a hand shoot up from the audience and slowly give the thumbs-down sign. It was his wife, Marilyn.
mXNy TIL that the Star Spangled Banner’s melody was based off a British drinking song called “To Anacreon in Heaven”.