Unit 1: Birds that Swim Instead of Fly
Unit 2: The Venus Flytrap
Unit 3: The Peculiar Platypus
Unit 4: Kelp: The Underwater Forest
Unit 5: Cheetahs Are Fast Cats
Unit 6: Poisonous Plants: Good or Bad?
Unit 7: Around the World in 72 Days
Unit 8: The Search for the Northwest Passage
Unit 9: The Great Race of Mercy
Unit 10: Daring Rescue During the Buffalo Blizzard of 1977
Unit 11: Stranded Near a Mountaintop
Unit 12: A Monster Wave Flips Two Boats
Unit 13: Trapped Underground!
Unit 14: Krakatau, a Deadly Volcano
Unit 15: Destructive Wind and Water: The Galveston Hurricane
Unit 18: Flash Flood in Big Thompson Canyon
Unit 19: Deadly Cloud from Lake Nyos
Unit 20: Gunpowder Inventions
Unit 21: The Miracle of Movable Type
Unit 22: Galileo’s Discoveries About the Universe
Unit 24: Joseph Lister’s Fight Against Germs
Unit 25: The Janitor’s Invention
Unit 27: Earth’s Hot Spots
Unit 28: Big Blast in Siberia
Unit 29: The Story of the Brooklyn Bridge
Unit 30: Libraries Make the World a Smarter Place