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860 milligrams is .860 grams. Since a pound (of anything) is about 2.2 Kilograms (of anything), this means that 1 pound = 2200 grams. So far, so good, right? So, IF we have .860 grams, we have .860/2200 pounds (of something!) ... which, of course, equates to approx. .000331 pounds. And .000331 pounds x 16 ounces/pound = .0063 ounces! Not very much, right? Well, er, actually it IS! ...

... Consider that, of the total weight of roughly 9700 lbs (4400 Kg) of "Little Boy" (the bomb dropped on Hiroshima), the U-235 'warhead' itself weighed (only) 60Kg (about 132 lbs.) And, of this 60000 grams, less than one (ONE!) gram of it was actually converted to the energy (heat, radiation, etc.) that destroyed the entire city - the figure often quoted is, er, ... 860 milligrams - which. curiously, is the exact amount listed at the beginning of this exercise!

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