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TIL George Koval: Soviet master spy that infiltrated the Manhattan project, stole nearly all of our nuclear secrets, single-handedly provided the key technology for Russia’s nuclear arsenal, and was only discovered as a spy in 2002.

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e4L TIL James Earl Jones declined to have his name included in the credits of Star Wars and Empire Strikes Back, feeling his contributions were too insignificant.
5Ygdk TIL that ingredients in the average bottle of prestige perfume cost about $1.20 to $1.50. The actual liquid in a typical bottle of $150 perfume is less than 1% of the retail cost. The bottle, box and and display carton typically cost four to six times times more than the fragrance itself
Z8jkR TIL a unanimous 1893 decision of the United States Supreme Court found that federal tariffs on imported vegetables could target tomatoes, although they are botanically a "fruit of the vine." The parlance of common people and customary consumption during the main course motivated the ruling.
X0vgR TIL in 1970 one monkey's head was transplanted to the headless body of another monkey. Although the monkey was now paralyzed from neck down, they could still hear, smell, taste, eat and follow objects with its eyes. Died in 9 days because of immune rejection.
W7QM9 TIL Birds have mitochondria in their red blood cells, and during winter months there is more mitochondria and said mitochondria produce more heat. In at least some species this helps warm them up during that time of year.