Salman Khan is not afraid to make mistakes in his popular teaching videos. In fact, he considers them a feature.
"I’ll giggle every now and then because I make a mistake, which I think students say, "OK, it’s OK to make mistakes and it’s OK to giggle while doing mathematics," he says. "And it seems like a small thing. But when was the last time you giggled, you know, while doing a math problem?"
