To load ballast, just open a vent and let air rush into the balloon.
We can call them layships ( as in Lay's potato chips, could be a Canadian only thing...)
I'd love to spend all of my time attending user group meetings all over the world. Unfortunately I have to work for a living and have $0 discretionary funds available for such things.
"Consider a spherical bear, in simple harmonic motion..." -- Professor in the UCB physics department