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- 1Roller Coaster; Quicksand; Jelly-Side Down; Lemons; White TigerOctober 14, 1989
- 2Bee Stings; Bowling; High-Speed Elevator; Lemons; BoaOctober 21, 1989
- 3Race Cars; Spider Webs; Lemons; Tropical FishOctober 28, 1989
- 4Rain Forest; Buoyancy; Pouring Catsup; Lemons; Cold RemediesNovember 4, 1989
- 5Caffeine; Butterfly Migration; Autumn Leaves; Lemons; Doppler Effect; SlothNovember 11, 1989
- 6Surfing; Geothermal/Volcanoes; Luau; Sugar Processing; Hawaiian Language; EelNovember 18, 1989
- 7Whale Watch; Sunspots; Lemons; SkunkNovember 25, 1989
- 8Milky Way; Epilepsy; Lemons; Inventors Fair; CuttlefishDecember 2, 1989
- 9DNA; Rube Goldberg Contest; Parrot Chat; Chewing Tin Foil; SeahorseDecember 9, 1989
- 10Marathons; Celestial Navigation; Cataracts Chat; Lemons; EchidnaDecember 16, 1989
- 11Spinal Cord; Glue; Lemons; Dog BehaviorDecember 23, 1989
- 12Cheese; Aging; Appendix Chat; WolvesDecember 30, 1989
- 13Supercomputer; Greenhouse Effect; House Creaking; OwlJanuary 6, 1990