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- S40.E1 ∙ Doomsday Volcanoes
- S40.E2 ∙ Decoding Neanderthals
- S40.E3 ∙ Rise of the Drones
- S40.E4 ∙ Who Killed Lindbergh's Baby?
- S40.E5 ∙ Building Pharaoh's Chariot
- S40.E6 ∙ Earth from Space
- S40.E7 ∙ Mind of a Rampage Killer
- S40.E8 ∙ Meteor Strike
- S40.E9 ∙ Ancient Computer
- S40.E10 ∙ Australia's First 4 Billion Years: Awakening
- S40.E11 ∙ Australia's First 4 Billion Years: Life Explodes
- S40.E12 ∙ Australia's First 4 Billion Years: Monsters
- S40.E13 ∙ Australia's First 4 Billion Years: Strange Creatures
- S40.E14 ∙ Oklahoma's Deadliest Tornadoes
- S40.E15 ∙ Manhunt: Boston Bombers
- S40.E16 ∙ Ground Zero Supertower
- S40.E17 ∙ Megastorm Aftermath
- S40.E18 ∙ Making Stuff Faster
- S40.E19 ∙ Making Stuff Wilder
- S40.E20 ∙ Making Stuff Colder
- S40.E21 ∙ Making Stuff Safer
- S40.E22 ∙ Cold Case JFK
- S40.E23 ∙ At the Edge of Space
- S40.E24 ∙ Asteroid: Doomsday or Payday?