S04E01 - Flight Trainers; Snake Bite; Hedgehoh Chat; Cold Remedies

S04E02 - Caves; Lasers; Skin Wrinkle Chat; Whale Birth

S04E03 - Hypothermia; Moon; Voice Change Chat; Yak

S04E04 - Sponges; Bed of Nails; Probability; Pelicans

S04E05 - Bees; Blood Pressure; Bruises Chat; Hiccups

S04E06 - Telescopes; Food Myths; Manatee

S04E07 - Fossil Dig; Mirrors; Frostbite Chat; Elephants

S04E08 - Wind Blow; Baldness; Soda Pop Fizz Chat; Cranes

S04E09 - Alcohol; Helium Balloons; Backache Chat; Roller Coaster; Snow Monkeys

S04E10 - Diabetes; Frozen Food; Flat Feet Chat; Battery Inventions; Alligators

S04E11 - Immune System; Skiing; Blimp; Beaver

S04E12 - Pterodactyl; Rube Goldberg; Black Box Chat; Quickies

S04E13 - Baseball Bats; Polarized Light; Dreams Chat; Inventors Fair; Falcon