Knewton Takes Adaptive Learning To The Next Level (TechCrunch)Textbooks are so yesterday. Yet student backpacks are still weighed down by them. Replacing those textbooks with software has been one of the great white whales of computing going back at least to Alan Kay's original Dynabook concept 40 years ago (which he is still working on). Today, there are a slew of startups tackling the problem of e-learning ( Brightstorm , iKnow , Grockit , PrepMe ...