Polaroid Film

Today I learned how Polaroid film works. I mean the actual chemical reactions (at least on a basic level) and how 14 layers were required and activated by a strong base in the bottom white part that was squeezed onto the film when the film was ejected and how the die diffused up to the surface selectively! So cool!  Also the fact that this process took 14 years to develop - something that would never be funded in industry today.