Khan Academy [...] has quickly become the largest "school" in the world.
Have you ever had trouble keeping up with class?
Volunteers have helped translate his videos.
He has added many other subjects to the website.
Many teachers have started to use Khan's lectures to supplement their classroom instruction.
It has attracted about ten million students a month.
Salam has attracted financial support from many people.
He has personally created over three thousand videos.
You have changed my life ... /Khan's life has changed too.
Amazingly, Khan has never charged any money for his videos.
Have you been bored because your class moves too slowly for you?
So far, he has raised almost 20 million dollars.
He has added many other subjects. (emphasis on # of subjects)
