Oh wow, this is soooo easy, why don't you ask something difficult, like "why is my big brother so stoopid" or something. Anyway, here goes:
You first get a wonder bra that has a bit of padding to hide the nuclear stuff. If you have really big...errr...well if you are generously...k nvmind, just get a big bra.
Then you buy some Uranium (I didn't have to cap that but I thot it would stand out better that way), but it has to be U235 because U238 is much cheaper but it won't explode no matter how hard you try.
So now you have U235 and all you have to do is to stuff it in your bra (between the padding and the outer part - this is to hide it from airport people - until you reach critical mass. This is the amount where a fissionable substance will begin to fission and will be essentially uncontrolable.
The critical mass for U235 is approximately 600kg or about 1.5 tons, but don't worry, you won't have to get a mastectomy to accomodate all this rock, because once you reach it, you will no longer have any breasts to worry about. Nor will any of your closest friends.
BTW, it doesn't have to be a WonderBra, any bra will do, or even a plastic grocery bag.
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