A meringue is really nothing but a foam. And what is a foam after all, but a big collection of bubbles? And what's a bubble? It's basically a very flimsy little latticework of proteins draped with water. We add sugar to this structure, which strengthens it. But things can, and do, go wrong.
Alton BrownI think in the end there are only 20 or 30 tenets of basic cooking. It's going at perhaps the same issue from different angles, from different points of view, from different presentation styles, that really makes things sink in and become embedded.
Alton Brown