Watch How the Universe Works - Season 4 Episode 7

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Episodes — Season 4
#	Title	Watch
1	How the Universe Built Your Car	Play
2	Earth, Venus's Evil Twin	Play
3	Monster Black Hole	Play
4	Edge of the Solar System	Play
5	Dawn Of Life	Play
6	Secret History of the Moon	Play
7	The First Oceans	Playing
8	Forces of Mass Construction	Play