Ep 1

Noisy/Quiet: Production & Processing of Sound

Ep 2

Noisy/Quiet: The Ear

Ep 3

Noisy/Quiet: How People & Animals Use Sound

Ep 4

Noisy/Quiet: Music

Ep 5

Noisy/Quiet: Range of Vibration

Ep 6

Forces and Motion

Ep 7

Forces and Fields

Ep 8

Forces: Buoyancy and Gravity

Ep 9

Forces and Machines

Ep 10

Forces: A Spectacle of Forces

Ep 11

Growth/Decay: Sex and Seeds

Ep 12

Growth/Decay: Human Growth

Ep 13

Growth/Decay: Decay

Ep 14

Growth/Decay: Human Cultures/Land Forms

Ep 15

Growth/Decay: Cycles Upon Cycles

Ep 16

Fast/Slow: Speed Up, Slow Down

Ep 17

Fast/Slow: Rhythms of Nature

Ep 18

Fast/Slow: Lifetimes

Ep 19

Fast/Slow: Speed and Racing

Ep 20

Fast/Slow: Time and Time Again

Ep 21

Communication: Human Communication

Ep 22

Communication: Animal Communication

Ep 23

Communication: Machinery of Communication

Ep 24

Communication with Other Species

Ep 25

Communication: Feedback

Ep 26

Food/Fuel: Animal Food

Ep 27

Food/Fuel: Human Food

Ep 28

Food/Fuel: Growing and Processing Food

Ep 29

Food/Fuel: Fueling Machines

Ep 30

Food/Fuel: The Sun Makes Everything Go

Ep 31

Hot/Cold: People's Temperatures

Ep 32

Hot/Cold: Animal and Plant Adaptations

Ep 33

Hot/Cold: How Hot or Cold Can It Get?

Ep 34

Hot/Cold: Heat and Work

Ep 35

Hot/Cold: Temperatures on Earth/In Space

Ep 36

Light/Dark: The Sun

Ep 38

Light/Dark: Electromagnetic Spectrum

Ep 39

Light/Dark: The Eye

Ep 40

Light/Dark: Light Sources

Ep 41

Near/Far: Seeing Isn't Always Believing

Ep 42

Near/Far: Mapping and Navigating Near Home

Ep 43

Near/Far: Mapping and Navigating Over Earth

Ep 44

Near/Far: Space Travel

Ep 45

Near/Far: Knowing Where You Are

Ep 46

Order/Disorder: Regular Patterns

Ep 47

Order/Disorder: The Body – An Ordered System

Ep 48

Order/Disorder: Social Order

Ep 49

Order/Disorder: Disordered

Ep 50

Order/Disorder: Sum of Its Parts

Ep 51

Surfaces: Protection

Ep 52

Surfaces: Shapes and Functions at the Surface

Ep 53

Surfaces: Surface Tension and Bubbles

Ep 54

Surfaces: Surface of the Earth

Ep 55

Surfaces: The Atmosphere

Ep 56

Big/Small: Animal Sizes/Scaling

Ep 57

Big/Small: Animal Habitats

Ep 58

Big/Small: Dinoaurs

Ep 59

Big/Small: Volume & Efficiency

Ep 60

Big/Small: How Big is Big?

Ep 61

Crowded/Uncrowded: Human Crowding

Ep 62

Crowded/Uncrowded: Optimum Populations in Nature

Ep 63

Crowded/Uncrowded: Contrasts in Densities of Materials

Ep 64

Crowded/Uncrowded: Down Among the Atoms (Liquids & Solids)

Ep 65

Crowded/Uncrowded: Human Survival/Controlling Densities