The narrators speak easy and clearly. They don't speak too fast or too slow.
The visuals accompany with what's being said.
You learn more than just a language
Most documentaries are pretty interesting as well
The only downside I can think of is that most of the documentaries I've watched voice over English speaking scientists when they're being interviewed, and as a native English speaker, it's annoying having to seperate between what's being said in my target language and what's being said in English
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