Yesterday we looked at the sites and timeline of nuclear weapons tests. Today, however, as we learn more about North Korea’s hydrogen bomb test, some are wondering whether it really was a hydrogen bomb or something else. After all, there are different ways to build the bomb. Some suggest North Korea tested an atom bomb on steroids, more properly called boosted fission. Anyway, the New York Times does a nice job explaining the differences between the atom bomb, the hydrogen bomb, and how we can infer what North Korea tested from the calculated size of the blast.

Credit for the piece goes to Josh Keller, Ford Fessenden, and Tim Wallace.