iBooks Textbooks Now Cover 100% Of US And UK "Core" Curriculum 

Apple:

iBooks Textbooks offer iPad® users gorgeous, fullscreen textbooks with interactive animations, rotating 3D diagrams, flick-through photo galleries and tap-to-play videos. iBooks Textbooks don’t weigh down a backpack, can be updated as events unfold and don’t need to be returned. With nearly 25,000 educational titles created by independent publishers, teachers and leading education services companies, including new educational content from Cambridge University Press, Oxford University Press and Hodder Education, iBooks Textbooks now cover 100 percent of US high school core curriculum and the General Certificate of Secondary Education (GCSE) core curriculum in the UK.

I’m not certain what ‘core’ means, but that’s really good progress nonetheless. The difference between being able to say iOS has most of the content versus all of the content cannot be understated.