What can lectures teach that a book can’t?

Some people learn much better from books than from lectures. That probably depends in part on the quality of the lecturer (and the book), but also on personal learning style and preferences. And that is not a problem: there are plenty of good books to learn from. What can a lecture give on top of this (apart from determining the “examinable material”, which should be a secondary or third (ternary?) consideration at most)? Continue reading