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TIL about The Pig Precinct. In 1972 after the Iowa state supreme court ordered legislative redistricting a new district was created that did not have any human residents, just pigs. They were the only full-time residents housed in an experimental animal disease laboratory.

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LQL7d TIL that Saltwater Swimming Pools aren't very salty and that there is a widespread misconception that they do not use chlorine. In fact, saltwater pool water is only mildly salty (barely taste-able) and has similar chlorine levels as a regular chlorinated pool.
W7EPL TIL that in 1943, the hull of the tanker ship SS Schenectady cracked in half while docked in Portland, Oregon. The sound of the fracture was reported to have been heard over a mile away, and the cause of the failure wasn’t fully understood for another 50 years.
d0BB TIL that in 2011 researchers let 100 paper planes go 23 miles above Germany. Since then some have been found in Canada, USA, Australia and South Africa.
XAar TIL that in 1642, a man was executed because a deformed piglet looked like him. He was convicted of bestiality.
660J TIL there are things called metamaterials that are artificially engineered materials with properties not found in nature. These properties are the result of their precisely designed structure. Some have the ability to reverse the refractive index, allowing for the possibility of superlenses.