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- OverviewSep 10, 1993-Feb 11, 199420 episodesEpisodes20. Eyeball Feb 11, 1994
- A study of eyesight includes an interview with a virtual-reality designer.
- 19. Outer Space: Distances Feb 4, 1994
- Facts about planets, stars and galaxies, and a visit to a California observatory.
- 18. Electricity: Current Jan 28, 1994
- Electricity, the flow of electrons.
- 17. Cells Jan 21, 1994
- Living things are made of cells; DNA; amoeba and paramecium.
- 16. Light and Color Dec 24, 1993
- White light; reflected colors; neon art; lasers.
- 15. Earth's Seasons Dec 17, 1993
- How the Earth tilts and rotates on its axis as it journeys around the sun.
- 14. Structure Dec 10, 1993
- Structural shapes depend on their purpose.
- 13. Garbage Dec 3, 1993
- An explanation of nonbiodegradable waste is accompanied by a reminder to reduce, reuse and recycle.
- 12. Sound Nov 26, 1993
- How sound is produced and how the ear is able to receive it. Guest: rock group Soundgarden.
- 11. The Moon Nov 19, 1993
- The cycle that determines the changes in the moon's appearance.
- 10. Simple Machines Nov 12, 1993
- Simple machines; roller coaster; bicycles.
- 9. Biodiversity Nov 5, 1993
- How plants and animals function together in ecosystems.
- 8. Chemistry: Phases of Matter Oct 29, 1993
- A visit to a steel mill demonstrates how matter exists in three forms: solids, liquids and gases.
- 7. Digestion Oct 22, 1993
- How the digestive system gets energy from food; a steam engine that runs on cornflakes.
- 6. Gravity Oct 15, 1993
- Bill Nye talks about what holds the oceans on the Earth and answers other questions about gravity.
- 5. Buoyancy Oct 8, 1993
- A hot-air balloon ride and a trip to the aquarium help Bill Nye explain why things float.
- 4. Dinosaurs Oct 1, 1993
- Fossils of dinosaurs; guests Robin Leach, John Ratzenberger.
- 3. Skin Sep 24, 1993
- How the skin regulates body temperature, protects the inner body and provides the sense of touch.
- 2. Earth's Crust Sep 17, 1993
- A study of the Earth's surface and how it differs from the Earth's core.
- 1. Flight Sep 10, 1993
- How objects create differences in air pressure to develop the lift they need to fly.