While we assumes that the students have a questions during the lecture, do you have enough information to clarify those question with out plan?
Either ask for questions to be submitted in advance or answer questions at the next scheduled lecture. Unless you know the answer!
Before answering I want to point:
1- we know very well the matter that we teach (and conduct researches) - but we cannot know ALL
2- our students are CLEVER: some of them are the future of scientific research
3- a good teaching has to be SINCERE, TRUE and PARTICIPATIVE: as lecturer we are not only a pipe to pass our knowledge to their brain but we have to help them to develop their skills of learning by themselves.
4- we have to be sincere and be able to say: " I know a lot in invertebrate zoolgy (for example- in my case) - but I don't know / have not actualy a good answer to your very interesting question".
SO: when I have not a good answer to a good question - I tell the true: and say "I don't know! your question is very interesting and I ask you to find the answer in the webb of in the library and tell us it in the next lesson"
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