Leopard (October 29, 1983) Hypnosis; Sky Blue; Seeing Stars Chat; Cold Remedies (November 5, 1983) Visual Cliff; Heart; Ears Pop Chat; Wolves (November 12, 1983) Video Games; Holograms; Funny Bone Chat; Onions & Tears Chat (November 19, 1983) Color Blindness; Taste Buds; Black Hole Chat (November 26, 1983) Digital Sound; Eggs; Teeth Chatter Chat; Camel (December 3, 1983) Ultrasound; Spacesuit; Knuckles Crack Chat; Porcupine (December 10, 1983) Robots; X-Terrestrials; Headaches Chat; Parrots (December 17, 1983) Wagon Wheel; Prosthetics; Armadillo (December 24, 1983) Police Radar; Voice Synthesis; Skin & Wrinkles Chat; Snake & Lizard (December 31, 1983) Karate; Lightning; Tears Chat; Opossum (January 7, 1984) Season 2 (1984–1985) Mummies; Bicycles; Helium Chat; Owl (October 13, 1984) Hot-Air Balloons; Hearing; Side Stitch Chat; Beluga Whales (October 20, 1984) Fire; Artificial Heart; Penguins (October 27, 1984) Lie Detector; Golf Balls; Hiccup Chat; Cold Remedies (November 3, 1984) Imploding Buildings; Snoring; Stomach Growl Chat; Walrus (November 10, 1984) Computer Graphics; Smell; Tarantula Chat; Inventors' Fair (November 17, 1984) Pain; Optical Illusions; Wine Glass Sing Chat; Iguana (November 24, 1984) Electricity; Vision; Tennis Elbow Chat; Bubbles (December 1, 1984) Thermography; Voice; Yawn Chat; Pronghorn (December 8, 1984) Car Crash; Allergies; Blush Chat; Reindeer (December 15, 1984) Sports Clinics; Radioactivity; Acne Chat; Baby Tigers (December 22, 1984) Space Shuttle (December 29, 1984) Balance; Cooking; Scientists Disagree; Eagle (January 5, 1985) Season 3 (1985–1986) Earnie; Rainbow; Popcorn Chat; Pygmy Hippo (October 12, 1985) Dinosaurs; Bullet Proof Vest; Heartburn Chat; Killer Whales (October 22, 1985) Space Shuttle; Rube Goldberg; Crazy Inventions (October 29, 1985) Chimp Communication; Bends; Sweating Chat; Cold Remedies (November 2, 1985) Boomerangs; Cooking Chemistry; Bears (November 9, 1985) Comets; Perpetual Motion; Warts Chat; Sharks (November 16, 1985) FBI; Stomach; Llama (November 23, 1985) Cancer; Tennis Racquets; Sneezing Chat; Badger (November 30, 1985) Punting A Football; Color; Jet Lag Chat; Sea Lions (December 7, 1985) Muscles & Bones; Einstein; Falling Stars Chat; Raptor Center (December 14, 1985) Earthquakes; Lungs; Bats (December 21, 1985) Headaches; Eggs & Equinox; Hot Pepper Chat; Inventors' Fair; Lion (December 28, 1985) Singing In The Shower; Calories; Sun Tanning Chat; Patagonian Cavy (January 4, 1986) Season 4 (1986–1987) Flight Trainers; Snake Bite; Hedgehog Chat; Cold Remedies (October 11, 1986) Caves; Lasers; Skin Wrinkle Chat; Whale Birth (October 18, 1986) Hypothermia; Moon; Voice Change Chat; Yak (October 25, 1986) Sponges; Bed Of Nails; Probability; Pelicans (November 1, 1986) Bees; Blood Pressure; Bruises Chat;