To get people used to the idea that nuclear weapon detonations are "just gasoline explosions".

I think they found a way since 1945 to make better use of the electromagnetic sweep that's done at the initiation of the fission reaction; such that it's converted to use in heating up the surrounding instead of escaping to your eye in such extreme and useless quantity.

I think they use more fusion components than they once did; such as the tritium boosting gas in the primary pit; such that it would be a "fizzle" without it; and this in turn causes less fission.

I think they use alot of the design ideas from Ripple II.
I think there is some fission; but much of even smaller modern devices rely on the fusion boosting for much of the yeild.

I think young girls are pretty.