Still, Bielefeldt said, after years of trying different things, they still struggle to draw more women into these male-dominated sciences.
"The important thing to note is how long we've been at this," Bielefeldt said. "The fact that we've made no tangible forward progress despite working on this for a long time is puzzling and depressing... and again, we're not sure what the secret is."
*For the record, Angela Bielefeldt is a science advisor for the NewsHour.
This article, reprinted with permission from PBS Newshour, was originally published on April 25, 2012.