Lewis Perin
I think you can find something about this from past threads in this
group by checking Google Groups. The way I remember it, it comes down
to the fact that caffeine, like many - nearly all? - substances, is
more soluble in water as temperature rises. I'm sure Dog Ma will slap
me down if I'm wrong here!

True all around, except that I'd never slap so distinguished a gentleman -
who also, given the diversity of his Oriental education, is probably both
kinds of gong-fu master.

Personally, I've gotten so annoyed with all the the pseudo-scientific
assertions that I've removed most of my former posts on this and related
subjects. Whatever one says, someone (often less informed) disagrees, so
they didn't seem a useful addition to the archive. Perhaps one of us will
borrow a lab for a week, do the definitive series of experiments, and end
the argument. Amazing that it hasn't been done already, and published on the
Web.

-DM