Online coursework brings lessons to anyone with a computer, but does it forget the importance of trained educators?Salman Khan, a former hedge fund analyst, started the non-profit Khan Academy in 2006 as a way to bring free, online education to students and educators all over the world. He got the idea after using his webcam and basic software to tutor his younger cousin in maths.Since then, Khan Academy’s 2,700 educational videos have received more than 98 million total views via YouTube. Khan has made most of the brief videos himself, though the organisation recently partnered with other educators to broaden coursework beyond maths and science....