Question

how long did the radiation from little boy and fat man stay in nagasaki and hiroshima?

Answer 1

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This radiation is still there but the levels are much lower now.
If you want to know how these 2 cities could be rebuild so quick after the bombings i'd suggest reading this article: http://www.straightdope.com/columns/read/2466/if-nuclear-fallout-lasts-thousands-of-years-how-did-hiroshima-and-nagasaki-recover-so-quickly

I hope this helps!

Answer 2

thank you so much got all the notes i needed on the subject