"In math, the girls outscored the boys in the exam graded anonymously, but the boys outscored the girls when graded by teachers who knew their names. The effect was not the same for tests on other subjects, like English and Hebrew. The researchers concluded that in math and science, the teachers overestimated the boys' abilities and underestimated the girls', and that this had long-term effects on students' attitudes toward the subjects."
This cartoon kind of makes the same point. We are too quick to ASSUME / EXPECT that girls are bad at math. But they AREN'T!!!
I am your teacher. Obey me.