I'm subscribed to Vsauce
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Also minutephysics is quite interesting and cool
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Ah, yes, that one is also very nice; forgot about it.
Then, there are always sites like
http://topdocumentaryfilms.com/, that keep a large collection of documentaries; problem is it doesn't help a lot in finding the interesting ones.
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In relation to ALToids' Cosmos recommendation, I'd personally check the original series first (the one with Carl Sagan), if you haven't already.
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