The trick will be to grab the interest of girls that age for this specific scientific topic. Chemistry and physics are not typically taught until high school due to the complexity of those topics and the prerequisites necessary to grasp the concepts.
One approach to grabbing their interest is to show some of the cool things that can be done with nanotechnology. One that my daughters remember from a recent museum visit is the self cleaning socks that absorb odors. Talking about more of these interesting inventions that rely on nanotechnology may be peak the interest of at least one of the girls earning the badge.
Mr. Selinz' comment is uninformed. A young girl (the primary age for Girl Scounts is well under 13, by the way) may well be nudged in the direction of a technical career because of the excitement of an event of this type and the welcome extended by the promotional badge. We are not talking about high school students here. I think every effort to reach out and engage young students who have little idea what technology is all about will pay off and should be encouraged.