If you're a curious child and you get a new dog, you discover all kinds of things. Gravity has new meaning, when you're racing down a slide toward your eager-beaver dog waiting at the bottom (uh-oh!). Friction has a new meaning, when your slippery dog escapes from the bath (soap+fingers=not enough friction). But love has a new meaning too, when you and your cosmic dog become the center of your own universe.

Stuff in common (matter) -- Phase-crazy dog (phases of matter) -- Dog in motion (motion) -- The howl of the hunt (sound) -- Push-pull morning (force) -- What will it take? #1 (inertia) -- What will it take? #2 (inertia) -- Falling toward earth #1 (gravity) -- Falling toward earth #2 (gravity) -- Attracted to a magnet (magnetism) -- Light stops (energy) -- Heat goes (energy) -- Extra electrons #1 (electricity) -- Extra electrons #2 (electricity) -- Remembering friction (friction) -- Forgetting friction (friction) -- Racing through space (relative motion) -- Reflecting on a star (reflection of light) -- Our place in the universe (paradox)