Sarah Johnson makes a call during the first half of an April 2014 preseason NFL football game between the Seattle Seahawks and the San Diego Chargers. Stephen Brashear/AP hide caption

itoggle caption Stephen Brashear/AP

There's a widely held assumption that a slight imbalance in male births has its start at the very moment of conception. But researchers say factors later in pregnancy are more likely to explain the phenomenon. CNRI/Science Source hide caption

itoggle caption CNRI/Science Source

Ellen Pao, a former partner at Silicon Valley venture capital firm Kleiner Perkins Caufield & Byers, says women were excluded from all-male meetings at the company and denied seats on boards. The firm says she was fired for poor performance. Robert Galbraith/Reuters/Landov hide caption

itoggle caption Robert Galbraith/Reuters/Landov

Eight-year-old Tomás Rocha, a third grader at Malcolm X Elementary School in Berkeley, Calif., is among a handful of gender non-conforming students at the school. Brett Myers/Youth Radio hide caption

itoggle caption Brett Myers/Youth Radio

In diverse workplaces and classrooms — such as this one at Connections Education in Baltimore — recent research suggests that adhering to standards of political correctness can actually boost, rather than inhibit, the generation of fresh ideas. Tom Dubanowich/PR Newswire hide caption

itoggle caption Tom Dubanowich/PR Newswire

Josh Kronberg-Rasner was the only openly gay employee at a food service company in Casper, Wyo. He was fired in 2012 shortly after being assigned a new manager. Miles Bryan/Wyoming Public Media hide caption

itoggle caption Miles Bryan/Wyoming Public Media

The Colorado Rush, a gay rugby team in Denver, at practice. "I've always thought of myself as ... the rugby player that happens to be gay," says Skyler Meyer. "I never want to be the gay man who happens to play rugby." Luke Runyon/KUNC hide caption

itoggle caption Luke Runyon/KUNC

A product image shows the new Research Institute playset from Lego, which features women in roles as three scientists. In January, the company was criticized by a girl who said all its female characters were "boring." Lego hide caption

itoggle caption Lego