On Tue, 16 Oct 2007 01:13:56 -0700, Ian
wrote:

How do you think helium balloons work?

You have me there. However, how many do you think are in use? I would
guess somewhere between zero and none. For all practical purposes they
don't exist.

Myself, I like to fly small hydrogen balloons. Dry cleaner bags. You
dissolve aluminum chips in lye to get the hydrogen.

Casady