Re: Captain America Easter Eggs Thread *Spoilers*
I'm pretty sure it was because Howard states how it's so rare, the shield is the only amount of it they have. In IM2 Howard states, through video, that he's hidden a special energy source for Tony to figure out how to make because he "was limited by the technology of his day".
A New Hope The Empire Strikes Back
Revenge of the Sith Return of the Jedi
Carrie/Machete Order: 4 films..Best Narrative Structure Possible
Search your feelings. You know it to be true.