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The key is in surface moisture.

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neny7 TIL that soldiers stop marching in unison when crossing bridges so they don't collapse.
EggP0 TIL that during The Great Migration, Detroit's African American population increased 2000% in just 19 years (1910-1929)
9RgB TIL the waste produced by coal power plants is more radioactive than that generated by nuclear power plants
5gkQ TIL Judge Judy isn’t actually a judge on her television show, but is actually playing the role of an arbiter. Also, the show pays for any money awarded to the plaintiff.
eaPD TIL that there is a siren for the Holocaust Remembrance Day that literally stops everyone in their tracks