What I loved most about Bomb is how it marries being accessible with being intelligent and informative. It's hard to see this as a book specifically for young people--it works just as well for adults, I think--and it manages to be incredibly well-researched without actually feeling scholarly (in the dry, academic sense, that is.). It's an introduction to the topic, it's true, but it's all the introduction most people will ever need. And in case you were wondering, it's just as gripping for those of us whose worst subjects were Chemistry and Physics!
Bottom line--I loved it. Sheinkin weaves together all kinds of different threads to tell a remarkable story, and it requires concentration, but it's more than worth it. Do not miss this one.