We recently found this great book at the local op shop, "101 Science Experiments" and decided to find out what the acid in vinegar does to a whole egg.
Into the glass the egg went, and immediately started fizzing. The kitchen smelled pretty pungent too!
A couple of days later, this is what the egg looks like.
We pricked it with a sharp knife, and out came the yolk and white, looking perfect, and the shell reduced to just a thin skin.