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TIL that the Allied forces were able to estimate the monthly production rate of German tanks using probability theory during World War 2.

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7BWX TIL that DeForest Kelley disliked repeating Dr. McCoy’s catchphrase “He’s dead, Jim”, which appears 20 times in the original Star Trek series. It became so famous, however, that he joked that the line would appear on his tombstone. It did appear in the first sentence of Kelley’s obituary.
mxb4Y TIL Planthoppers (Issus coleoptratus) has the only mechanical gears ever found in Nature. The first natural design that mechanically functions like our geared systems contrasting the gear-like structures previously found on other animals like the spiny turtle which were purely ornamental.
wO4W TIL that there is a 100% effective, safe form of reversible male birth control… that is unavailable because no corporations will back it, as they are afraid they won’t make any money from it as it is very cheap and effective after one use.
xV8R7 TIL The sponsor, ad agency, producers and most of the people involved in the production of "A Charlie Brown Christmas" thought it was doomed to fail. When it aired on December 9, 1965, half of American TV viewers tuned in.
Z887p TIL Jews are often associated as scheming merchants who love money because in the Middle Ages Christians were forbidden to lend out money with interest, Jews were not.