"Louis L. Perley III" wrote in message
...
Saw an article today about an aircraft that would change it's buoyancy, so
it would float up like a balloon and then change buoyancy and glide down.

From the article: "The aircraft, still in development, will be similar to a
submarine that changes its buoyancy, a form of gravity, to float on the
surface of the sea or cruise 300 ft below it. "

Since when is "buoyancy" a form of gravity? Since when does gravity have
more than one form usually known as, umm, gravity?

Cool idea, though.

--
Jim Fisher