All videos are from youtube.com:
1) An amazing introduction to Physics
2) A beautiful documentary about the story of Artificial Intelligence
3) Will Artificial Intelligence drive our future? have a taste of it with this beatiful documentary about Go game (trailer)
4) Great science fictions: Stranger Things, when the ordinary meets the extraordinary (trailer)
5) A must-watch documentary and a great story of music and passion: Searching for Sugar Man (trailer)