Heather Mac Donald has written and spoken extensively about how identity politics is hampering America’s ability to maintain its dominance in STEM fields. Our main competitors, most notably China, are focused on making sure the best scientists, mathematicians, and engineers are doing the work. They care nothing about gender. And they spend virtually every dollar related to STEM on hard research and analysis. The U.S., by contrast, is preoccupied with the gender and (to a lesser extent) the race and ethnicity of who is in the lab. And we pour money into promoting identity politics in STEM. Indeed, Elizabeth Harrington...