I hear tell that Japan knew the US had "One" bomb, and that they prepared (as much as one could) to accept that hit and to fight on. When the second came down, it was obvious that their intelligence was lacking. Not knowing how many there actually were, and that it was more than the one, they decided to fold, rather than run the bluff to the end of their....South East Asia Co-Prosperity Sphere.
Don't you just love semantics!
You can dis-prove Gravity with it!

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