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  • S4.E1 ∙ Rivers and Streams
  • S4.E2 ∙ Nutrition
  • S4.E3 ∙ Marine Mammals
  • S4.E4 ∙ Earthquakes
  • S4.E5 ∙ NTV Top 11 Video Countdown
  • S4.E6 ∙ Spiders
  • S4.E7 ∙ Pollution Solutions
  • S4.E8 ∙ Probability
  • S4.E9 ∙ Pseudoscience
  • S4.E10 ∙ Flowers
  • S4.E11 ∙ Archaeology
  • S4.E12 ∙ Deserts
  • S4.E13 ∙ Amphibians
  • S4.E14 ∙ Volcanoes
  • S4.E15 ∙ Invertebrates
  • S4.E16 ∙ Heart
  • S4.E17 ∙ Inventions
  • S4.E18 ∙ Computers
  • S4.E19 ∙ Fossils
  • S4.E20 ∙ Time