Back in 1992, toy company Mattel nearly had to recall its “Teen Talk” Barbie. Women’s groups protested the doll’s use of the phrase “Math class is tough.” They called it out for indirectly perpetuating a harmful stereotype-- that boys and men are better at math than girls and women. Research -- especially over the last 10 years -- has shown there is no innate difference in math ability between males and females. And yet the stereotype persists. Women earn 43% of all college math degrees, yet their presence is scarce in the higher echelons of mathematics.