You know, the incredible thing about quantum mechanics, there are many incredible things, but one of them, at least to me, is that it really works. It is the [science] of the universe. It describes what’s going on here on Earth and it describes what happens in the [early] universe that Andrei studies. And so, when we think about how those building blocks that leon was just [discussing] fit together to make the world around us, we use quantum mechanics to describe atoms, nuclei,  molecules, light. It is the theory of the world. And so it’s not surprising that we see it in many everyday [happenings] and many everyday applications. An example might be the lasers that you see in a compact-disc [machine], or the supermarket scanner.