Simple answer to any point in the discussion
Science.
Fallout does not seek out the how and why, many of you are forgetting the simple fact that this entire "universe" is based off of an unrealistic 50/60's fantasy of Nuclear Science
The mindset of the people doing this is. We have technology that makes it work, end of story.
Cheers, Deagonx
I find it more fun to speculate and try to think of a logical answer. Obviously they have to have some sort of technology that makes it work for them. There is no other explanation I can think of for having icing on a birthday cake so far from the war. I can't imagine icing for a cake would be high up on the list of survival items necessary in a Vault. Given limited space, it would be unlikely they would stock much, if any, icing.
Granted, I'm not running through the game questioning every event that happens to my character. I have found locations where I have fallen in-between some rocks and been unable to climb out. Completely unrealistic; however, I overlook it, reload, and continue playing.