[history lesson] Actually, I'm pretty sure Little Boy was a Gun type Fission bomb that started the Chain reaction by using a radioactive cesium or strontium isotope to produce the necessary neutrons to start the runaway Fission reaction of the nearly critical nuclear core.
Fat Man was of the implosion type where a shaped explosive charge blows 2 non-critical masses of nuclear material into a critical mass which then goes boom.[/history lesson]
You've lost speaking privileges. Why?
0) You're trying to talk Physics, for starters, not history. The history is that bombs were made, and they made some scary-big explosions. The Physics, you just got entirely wrong.
1) In the fission reaction in both of the atomic bombs, Uranium 235 breaks down into radioactive isotopes of Strontium and Cesium. They don't do much of anything when you collide them together, besides creating a larger blob of gamma-emitting crap.
2) A gun-type bomb operates by ramming two non-critical masses of fissionable material together. One mass is a blob in the middle of the bomb, and one mass is a smaller bullet with an explosive charge to propel it. Ram the two pieces together, and you get your chain reaction.
3) An implosion-type bomb is much trickier. Again, you have a non-critical mass at the center of the bomb, and a buffer around it. Outside the buffer is a layer of the same fissionable material surrounded by a layer of explosive. When the explosive goes off, the outer layer slams into the inner core, causing a similar reaction as the gun-type bomb, except that it is faster and more completely uses up the fissionable component of the bomb.
I've lived Oak Ridge for eleven years, been to Y-12 on the odd occasion, and I'm going on to the third year of my Physics bachelors. This stuff is so engrained in my being, that typing the above corrections was a reflex.
*Ahem* More to the point of the thread, how's about we stop (some of) the speculation and see some screenshots, Ace?