To wet your appetite I will only mention a test he did with about 30 Greek profs and graduate students assembled to hear a paper he gave in 2008 on teaching Greek communicatively: he asked them for the Greek words (English to Greek) of 10 basic objects or items any 6 year old Greek child in the classical world would have known. Words like “ball,” “yes,” “red,” etc. I can almost guaranty that whatever you guess the average grade was, you have guessed too high! Don’t believe me? Check it out here.