Far too many girls are told they don’t belong in math or science — that STEM fields are a better fit for boys. But it’s simply not true. Without women in scientific roles, we wouldn’t have innovative thinkers like Gitanjali Rao, who’s addressing the problem of lead poisoning in Michigan. America needs more women and girls in high-demand industries like health care, advanced manufacturing, clean energy and information technology. The future of our economy — and our drinking water — depends upon it.