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TIL that an Air Force Academy class ring lost in the Colorado wilderness in the late '60's was found fifty years later by an off-roader digging his vehicle out of the snow.

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xQB1 TIL Google Maps calculates their traffic by having all iPhones that have Google Maps open and Android phones that have location services turned on send anonymous bits of data back to Google
ne7BP TIL when poisonous frogs are fed zoo diets they no longer become poisonous. The wide variety of food in the wild supplies them with the chemicals for making poison.
Lk4lV TIL of Eugène-François Vidocq, a formal criminal who founded the first Private Detective agency in 1833. He mostly hired ex-convicts. His innovations include taking a plaster cast of a shoe print and introducing undercover work. He claims to have never informed on someone who stole for real need.
o7nr TIL the last grandson of Albert Einstein was also a physicist and died in 2008. He was the only grandchild of Albert Einstein to survive childhood.
78e5x TIL that instant coffee is freeze dried brewed coffee.