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TIL engineers building a bridge between Germany and Switzerland found that when the two halves met their elevations differed by 54 cm. Germany bases sea level on the North Sea, and Switzerland by the Mediterranean; someone messed up the correction, doubling it instead of cancelling it out.

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GYeAG TIL the Swastika symbol dates to 13000 BC and has been used by many cultures on nearly every continent.
0dRjA TIL about Bucky, a Labrador that journeyed 500 miles in 7 months from Virginia to South Carolina to reunite with his owner after he had temporarily left the dog behind while moving across states
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JYJPj TIL that Richard Nixon appointed four Supreme Court justices during his time as president of the United States.