Hiccups (November 8, 1986) Telescopes; Food Myths; Manatee (November 15, 1986) Fossil Dig; Mirrors; Frostbite Chat; Elephants (November 22, 1986) Wind Blow; Baldness; Soda Pop Fizz Chat; Cranes (November 29, 1986) Alcohol; Helium Balloons; Backache Chat; Roller Coaster; Snow Monkeys (December 6, 1986) Diabetes; Frozen Food; Flat Feet Chat; Battery Inventions; Alligators (December 13, 1986) Immune System; Skiing; Blimp; Beaver (December 20, 1986) Pterodactyl; Rube Goldberg; Black Box Chat; Quickies (December 27, 1986) Baseball Bats; Polarized Light; Dreams Chat; Inventors' Fair; Falcon (January 3, 1987) Season 5 (1987–1988) Plastic Surgery; High-Speed Bicycles; "Lemons"; Ailing Whale (October 10, 1987) Treasure Diving; Blackboard Chat; "Lemons"; Mothballs & Wintergreen (October 17, 1987) Polar Expedition; Inventors' Fair; Sea Otter (October 24, 1987) Submarine; Budgies In A Truck; Uvula Chat; Lemons, Sea World Science Day (October 31, 1987) Tornado; Exploratorium; Laryngitis Chat; "Lemons"; Beach Science (November 7, 1987) Neon Lights; Rube Goldberg; Aspirin Chat; "Lemons"; Puffins (November 14, 1987) MRI; Segment Update; Stars Twinkle Chat; "Lemons"; Kitchen Science (November 21, 1987) Cavities; Snowflakes; Reflexes Chat; "Lemons"; Arctic Fox (November 28, 1987) Cocaine Addiction; Laundry Science; "Lemons"; Sled Dogs (December 5, 1987) Child Development; Bridges; "Lemons"; Octopus (December 12, 1987) Sailing; Skin Lotion Chat; "Lemons"; Jelly Fish (December 19, 1987) Bureau Of Standards; Gravity Contest; Upset Stomach Chat; "Lemons"; Kelp Forest (December 26, 1987) Gymnastics; Computer Vision; "Lemons"; Golden Monkeys (January 2, 1988) Season 6 (1988–1989) Skydiving; Facial Symmetry; "Lemons"; Baby Orangutans (October 15, 1988) Movie Creatures; Cholesterol; "Lemons"; Suntan; Vulture (October 22, 1988) Microsurgery; Strobes; Coordination Chat; "Lemons"; Aardvark (October 29, 1988) Air Traffic Control; Feet; Bell Curves; Tracking Bears (November 5, 1988) Clouds; Rube Goldberg; Skin Itch Chat; Home Runs; Cold Remedies (November 12, 1988) Woods Hole – Lobster, Cell Division, Research (November 19, 1988) Rockets; CPR Chat; Inventors' Fair; "Lemons"; Aerosol Sprays; Cow (November 26, 1988) Fireworks; Papermaking; Gas Chat; "Lemons"; Slow Loris (December 3, 1988) Insomnia; Electron Microscope; "Lemons"; Exponentials; Giraffe (December 10, 1988) Liquid Nitrogen; Dolphins; Superconductivity Chat; "Lemons"; Insects (December 17, 1988) Synthesizers; Maple Syruping; Non-Stick Pans; Wind Chill Chat; "Lemons"; Serval (December 24, 1988) Magnets; Forest Fires; Night Blindness Chat; Lynx (December 31, 1988) Horse Jumping; Toys In Space; Dust Bunnies; Carnivorous Plants; "Lemons"; Toucan (January 7, 1989) Season 7 (1989–1990) Roller Coaster; Quicksand; Jelly-Side Down; "Lemons"; White Tiger (October 14, 1989) Bee Stings; Bowling; High-Speed Elevator; "Lemons"; Boa (October 21, 1989) Race Cars; Spider Webs; "Lemons"; Tropical Fish