Note: The story has been updated to include news of the launch, which occurred a day earlier than had been announced. Free online tutorial service Khan Academy has launched a new series of ...

Since 2006 the Khan Academy, named for its founder Salman Khan, has provided free video lectures on subjects such as mathematics, biology and history. As we've reported before Khan garnered praise ...

The headquarters of what has rapidly become the largest school in the world, at 10 million students strong, is stuffed into a few large communal rooms in a decaying 1960s office building hard by the ...