Lighter than Hydrogen

After a few months of painstaking scientific labor, Number 21 finally created a gas that is even lighter than hydrogen (and a lot more inert, too). Obviously, she chose to demonstrate this to the scientific community by filling herself up with it.

Number 21, Art (c) Joseph Staleknight

A/N: I also created a story to go along with this pic! Link to be added when I upload it.