Can I make popcorn with any corn? Up until today I only knew about one type of corn for popcorn. Searching for Peruvian food I found out that in Peru there are different "popcorn" varieties.

So that made me think: is it possible to make popcorn with just any variety of corn? If not, what properties do these corn varieties have that allow then to be popped and not any others?
The answer it seems is - no, you can't just use any variety of corn. It seems that you need in particular a hard shell around the kernel that is not present in sweetcorn varieties.

I also suspect that it is harder to make than one might imagine, you need a specific percentage of water in the kernel to get it to pop - this is why you can't store unpopped popcorn in the open and once opened needs to be used within a few months, as the water will evaporate and eventually the percentage will become too low to effectively pop.