Apple announced that downloads of its free educational material have topped the one billion barrier.
The firm's iTunes U content is said to be the world's largest online catalogue of free educational material from schools and leading libraries, with lectures, books, quizzes and courses.
Apple said more than 60% of the iTunes U app downloads are from outside the US.
UK institutions such as the Open University and Oxford and Cambridge colleges offer courses through the system, while organisations including the National Theatre also offer learning tools.
Apple said the Open University had passed 60 million content downloads.