Which was the first movie/show to use a certain characteristic or technique?

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3
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What is the original occurrence of this specific memory-loss / amnesia plot?

I am not searching for a specific movie I have seen, hence the question may be vague or a little off-topic (hopefully not too far). I am searching for the original movie (or source, maybe even in ...
2
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0answers
133 views

What is the origin of the “face behind a wall of equations” shot?

So, Hollywood really likes to make scientists and mathematicians write on plexiglass (or mirrors, or windows, or other transparent or reflective surfaces). Presumably it's so they can get shots like ...