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TIL - the pH scale used in chemistry and medicine was developed at the Carlsberg R&D lab in their effort to provide a more consistent product to their customers

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MGP8 TIL that due to a small change in design during construction, the Hyatt Regency Walkway collapsed on its opening day killing 114 people.
8eEVX TIL of phantom islands, an island which was included on maps for a period of time, but was later found not to exist. Commonly the result of navigational errors, mistaken observations, or deliberate fabrication, some have remained on maps for centuries before being "un-discovered".
xVZ5k TIL Saudi Arabia owns 15000 acres in California with water rights to the Colorado River so they can cheaply grow alfalfa to feed their cows
GAw9J TIL in 50,000 years' time, Niagara Falls will have eroded the remaining 32km to Lake Erie, and will therefore cease to exist.
xYn1 TIL the average height of Japanese men between 1602 and 1867 is estimated at only 5 feet 1 inch.