[cyen]

How absurd. The best part of this learning technique is the discussion and the collaboration between students to solve the puzzle - you even learn by pointing out false positives, with someone correcting you and reinforcing that bit of information. A textbook / reference book is entirely different from a classroom - what was that author thinking?

[InclinedPlane]

I think that author was thinking "hmm, how can I skip a long editorial fact-checking process without looking completely unprofessional."