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YEN-JIE LEE: So
during the class,

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I usually do a little vote
on the physical situation

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we are interested in
to predict what will be

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the outcome of the calculation.

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I think that is actually a very,
very interesting thing to do.

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First of all, that will attract
the attention of the students

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that we are going
to do a prediction

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of a physical situation.

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OK?

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So that's actually
the first purpose,

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to encourage participation
of the students into class.

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And then secondly, I can know
if the majority of the students

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already know the outcome or not
by looking at the vote result.

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So if I have--

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if I have my polarizer
orienting in this direction,

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can you predict what will happen
to the readout on the scope?

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Will I see signal or not?

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How many of you actually
think we will see signal

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if I arrange that?

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The electromagnetic
wave is actually

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pointing-- polarized in
the up and down direction.

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OK, one, two--

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OK, only four people think so.

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How many of you think
nothing will change?

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I'm sorry, nothing will
be observed by the scope.

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OK, most of you
actually think so.

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So let's actually really
do the experiment.

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I choose to use an analog method
instead of clicker or support

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with other technical tools.

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And that is because I
would like this process

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to be as smooth as
I could achieve.

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So doing it by raising
your hand, first of all,

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they have to do a lot
more by raising your hand

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instead of clicking a button.

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So that actually makes
a difference for them

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to focus on my question.

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OK.

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So secondly, I don't want
to do a automatic counting

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because usually,
they provide a graph,

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and I have to switch back
and forth between graph

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and my lectures or my
other lecture slides.

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And that usually
takes some time.

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And also, that
introduces interruptions

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during my lecture.