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