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• S4.E1 ∙ How the Universe Built Your Car
• S4.E2 ∙ Earth, Venus's Evil Twin
• S4.E3 ∙ Monster Black Hole
• S4.E4 ∙ Edge of the Solar System
• S4.E5 ∙ Dawn of Life
• S4.E6 ∙ Secret History of the Moon
• S4.E7 ∙ The First Oceans
• S4.E8 ∙ Forces of Mass Construction