Quick note

After the recent discussion of optimism here and a new post on conscience's journal mentioning the old glass half-empty/half-full question, I just had to note that my father the nuclear physicist always taught me that the glass was all full--of molecules. The fact that you can't see anything doesn't mean there's nothing there.

(Of course other physicists would point out that molecules are almost entirely empty space, so even the most solid objects are barely there at all. And still other physicists would tell you that there is no such thing as empty space because all of space contains potential particles. But I need to go now and I tell you I am not getting into a philosophical/quantum-mechanical discussion this morning.)