Today’s post is about nuclear bombs. Big boom. Mushroom clouds. Yep, those bombs. In our last post, we discussed the basic mechanism behind the uranium fission chain reaction. We also briefly talked about the difficulties involved in making it a continuous, feasible reaction. In this post, I’ll talk about the basic principles behind the design of a nuclear fission bomb. We’ll see two classic designs – the designs of the Hiroshima and the Nagasaki bombs, known as Little Boy and Fat Man. I assume that you have read the previous posts, or are familiar with basic scientific terminology related to nuclear reactions.