Understanding Nuclear Forces: A Middle Schooler's Guide

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Could somebody explain to me the nuclear forces (strong and weak)? I'm in middle school (8th grade), so please don't get too technical (but I can understand most things, or figure it out)

Thanks
 
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Try this: http://www.lightandmatter.com/html_books/4em/ch02/ch02.html#Section2.5
 
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