Acetate rocks, especially when its well written and you can pop into the prof's office and have a tea and chat and do some photocopying. I learned much more this way.
Chalk, we spent more time dictating and deciphering the babbling fool who can't communicate it all concisely from memory.
Chalk, we spent more time dictating and deciphering the babbling fool who can't communicate it all concisely from memory.