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TIL that bananas are slightly radioactive because of their potassium content and the small amounts of the isotope potassium-40 found in naturally occurring potassium. The banana equivalent dose (B.E.D) of radiation is sometimes used in nuclear communication to compare radiation levels and exposures.

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BPEK TIL In the book of “The princess bride” there’s a missing chapter called “the reconciliation” William Goldman (the author) wrote that if you wanted to read it you had to send a letter to the publisher house, and they would mailed it to you
16klV TIL that "U and non-U English" was a British theory of dialects in the 1950s that noted that the aspiring middle classes actually used "more refined" language than the upper classes - like "pardon?" instead of "what?", and to "pass on" instead of to "die"
46m5 TIL someone invented a circular sling shot or torus device called a “SlingATron” to launch things into space.
kOX5g TIL that the first nuclear explosion almost occurred by accident in Oak Ridge, Tennessee. Dr. Richard Feynman, a physicist who was working on the Manhattan Project, discovered that the military's "need to know" security resulted in a dangerous amount of uranium nitrate being stored with uranium-235.
Ldy9 TIL: In the 1900’s, the U.S. Navy became suspicious of homosexual activity in their sailors. They hired gay “decoys” to flirt with and find the homosexual seaman on board. However, the decoys became so popular that the Navy eventually just decided to stop..