Episode 1
Noisy/Quiet: Production & Processing of Sound
Episode 2
Noisy/Quiet: The Ear
Episode 3
Noisy/Quiet: How People & Animals Use Sound
Episode 4
Noisy/Quiet: Music
Episode 5
Noisy/Quiet: Range of Vibration
Episode 6
Forces and Motion
Episode 7
Forces and Fields
Episode 8
Forces: Buoyancy and Gravity
Episode 9
Forces and Machines
Episode 10
Forces: A Spectacle of Forces
Episode 11
Growth/Decay: Sex and Seeds
Episode 12
Growth/Decay: Human Growth
Episode 13
Growth/Decay: Decay
Episode 14
Growth/Decay: Human Cultures/Land Forms
Episode 15
Growth/Decay: Cycles Upon Cycles
Episode 16
Fast/Slow: Speed Up, Slow Down
Episode 17
Fast/Slow: Rhythms of Nature
Episode 18
Fast/Slow: Lifetimes
Episode 19
Fast/Slow: Speed and Racing
Episode 20
Fast/Slow: Time and Time Again
Episode 21
Communication: Human Communication
Episode 22
Communication: Animal Communication
Episode 23
Communication: Machinery of Communication
Episode 24
Communication with Other Species
Episode 25
Communication: Feedback
Episode 26
Food/Fuel: Animal Food
Episode 27
Food/Fuel: Human Food
Episode 28
Food/Fuel: Growing and Processing Food
Episode 29
Food/Fuel: Fueling Machines
Episode 30
Food/Fuel: The Sun Makes Everything Go
Episode 31
Hot/Cold: People's Temperatures
Episode 32
Hot/Cold: Animal and Plant Adaptations
Episode 33
Hot/Cold: How Hot or Cold Can It Get?
Episode 34
Hot/Cold: Heat and Work
Episode 35
Hot/Cold: Temperatures on Earth/In Space
Episode 36
Light/Dark: The Sun
Episode 38
Light/Dark: Electromagnetic Spectrum
Episode 39
Light/Dark: The Eye
Episode 40
Light/Dark: Light Sources
Episode 41
Near/Far: Seeing Isn't Always Believing
Episode 42
Near/Far: Mapping and Navigating Near Home
Episode 43
Near/Far: Mapping and Navigating Over Earth
Episode 44
Near/Far: Space Travel
Episode 45
Near/Far: Knowing Where You Are
Episode 46
Order/Disorder: Regular Patterns
Episode 47
Order/Disorder: The Body – An Ordered System
Episode 48
Order/Disorder: Social Order
Episode 49
Order/Disorder: Disordered
Episode 50
Order/Disorder: Sum of Its Parts
Episode 51
Surfaces: Protection
Episode 52
Surfaces: Shapes and Functions at the Surface
Episode 53
Surfaces: Surface Tension and Bubbles
Episode 54
Surfaces: Surface of the Earth
Episode 55
Surfaces: The Atmosphere
Episode 56
Big/Small: Animal Sizes/Scaling
Episode 57
Big/Small: Animal Habitats
Episode 58
Big/Small: Dinoaurs
Episode 59
Big/Small: Volume & Efficiency
Episode 60
Big/Small: How Big is Big?
Episode 61
Crowded/Uncrowded: Human Crowding
Episode 62
Crowded/Uncrowded: Optimum Populations in Nature
Episode 63
Crowded/Uncrowded: Contrasts in Densities of Materials
Episode 64
Crowded/Uncrowded: Down Among the Atoms (Liquids & Solids)
Episode 65
Crowded/Uncrowded: Human Survival/Controlling Densities