Grade K

• Unit A: From Egg to Salamander

  Unit B: Beneath Your Feet

  Unit C: Water, Water Everywhere!

  Unit D: A World of Wind

  Unit E: What Comes from What?

  Unit F: North, South, East, West

Grade 1

• Unit A: Forever Flying

  Chapter 1: A Tree Is Alive and A Sugar Maple Tree

  Lesson 1: A Tree Is Alive and A Sugar Maple Tree

  Lesson 2: Seeds Grow

  Lesson 3: A Tree Is Alive and A Sugar Maple Tree

  Chapter 2: Tricky Animals

  Lesson 1: Tricky Animals

  Lesson 2: Different Ways of Living

  Lesson 3: Forever Flying

  Chapter 3: Yo Wants to Know

  Lesson 1: Yo Wants to Know

  Lesson 2: Yo Wants to Know

• Unit B: Different Ways of Living

  Chapter 4: Feed Me!

  Lesson 1: Living Colors of a Coral Reef

  Lesson 2: Feed Me!

  Chapter 5: A Winter Walk in the Woods

  Lesson 1: A Winter Walk in the Woods

  Lesson 2: Who Shares the Lake?

  Lesson 3: Day and Night in the Desert

• Unit C: Beatrice Black Bear

  Chapter 6: A House Made of Dirt

  Lesson 1: Who Shares the Lake?

  Lesson 2: Backyard Treasures

  Lesson 3: A House Made of Dirt

  Chapter 7: Who Shares the Lake?

  Lesson 1: Swimming with the Pod

  Lesson 2: Beatrice Black Bear

  Lesson 3: It's a Ball of Poop

• Unit D: A Total Eclipse of the Sun

  Chapter 8: Meet a Meteorologist

  Lesson 1: Meet a Meteorologist

  Lesson 2: Meet a Meteorologist

  Lesson 3: A Visit to the Lighthouse

  Lesson 4: Yo Wants to Know

  Lesson 5: Yo Wants to Know

  Chapter 9: How We Know About the Sun

  Lesson 1: Day and Night in the Desert

  Lesson 2: A Total Eclipse of the Sun

  Lesson 3: Looking Closer at the Moon

  Lesson 4: How We Know About the Sun

• Unit E: Exploring Space

  Chapter 10: Eye, Magnifying Glass, Microscope

  Lesson 1: Eye, Magnifying Glass, Microscope

  Lesson 2: Click & the Kids

  Lesson 3: Magnet Races

  Lesson 4: Boats, Boats, Boats!

  Chapter 11: Fossils: Clues to Earth Long Ago

  Lesson 1: Eye, Magnifying Glass, Microscope

  Lesson 2: The Weather Glass

  Lesson 3: It's a Ball of Poop

• Unit F: Lift Off!

  Chapter 12: Gifts of the Sun

  Lesson 1: Gifts of the Sun

  Lesson 2: Gifts of the Sun

  Lesson 3: Making a Guitar

  Lesson 4: Making a Guitar

  Chapter 13: Blowing in the Wind

  Lesson 1: Blowing in the Wind

  Lesson 2: Lift Off!

  Lesson 3: Blowing in the Wind

Grade 2

• Unit A: Born to Run

  Chapter 1: Little School on the Prairie

  Lesson 1: A Living Fossil

  Lesson 2: Little School on the Prairie

  Lesson 3: A Garden in the City

  Lesson 4: Little School on the Prairie

  Chapter 2: If You Could Fly like a Bird

  Lesson 1: If You Could Fly like a Bird

  Lesson 2: Harpo's World

  Lesson 3: Born to Run

  Chapter 3: Dino Eggs…And What's Inside

  Lesson 1: Mystery of the Disappearing Mouse

  Lesson 2: Dino Eggs…And What's Inside

• Unit B: Brrrr! Above the Tree Line!

  Chapter 4: Wild in the City

  Lesson 1: Brrrr! Above the Tree Line!

  Lesson 2: Click & the Kids

  Lesson 3: Forest in Winter

  Lesson 4: Wild in the City

  Chapter 5: You Don't Need Dirt!

  Lesson 1: Mystery of the Disappearing Mouse

  Lesson 2: You Don't Need Dirt!

• Unit C: Made of Mud

  Chapter 6: Nestor's Dock

  Lesson 1: Nestor's Dock

  Lesson 2: Marvin and Friends

  Lesson 3: Dino Eggs…And What's Inside

  Chapter 7: Above the Earth

  Lesson 1: Made of Mud

  Lesson 2: Above the Earth

  Lesson 3: Above the Earth

• Unit D: Family of Planets

  Chapter 8: Deadly Storms

  Lesson 1: Deadly Storms

  Lesson 2: Forest in Winter

  Lesson 3: Forest in Winter

  Chapter 9: Click & the Kids

  Lesson 1: Family of Planets

  Lesson 2: Family of Planets

  Lesson 3: Dozens of Cousins, Trillions of Stars

  Lesson 4: Click & the Kids

• Unit E: Music Comes from Everywhere!

  Chapter 10: Extending Sight

  Lesson 1: Frozen Art: Wall of Ice

  Lesson 2: Frozen Art: Wall of Ice

  Lesson 3: Extending Sight

  Chapter 11: Echolocation Echo…What?

  Lesson 1: Music Comes from Everywhere!

  Lesson 2: Echolocation Echo…What?

  Lesson 3: Herring Hellos

• Unit F: Ask Jimmy and the Bug

  Chapter 12: Flying Stones

  Lesson 1: Ask Jimmy and the Bug

  Lesson 2: Ask Jimmy and the Bug

  Lesson 3: Flying Stones

  Chapter 13: Lost? Not if You're a Lobster

  Lesson 1: Magnetic Fluids

  Lesson 2: Magnetic Fluids

  Lesson 3: Lost? Not if You're a Lobster

Grade 3

• Unit A: Becoming the Horse

  Chapter 1: A Walk in the Woods

  Lesson 1: Menus from Mars

  Lesson 2: A Walk in the Woods

  Lesson 3: A Walk in the Woods

  Chapter 2: First in Flight?

  Lesson 1: Becoming the Horse

  Lesson 2: Diggin' Dirt

  Lesson 3: First in Flight?

  Chapter 3: The Clock Inside You

  Lesson 1: Blazing Forests

  Lesson 2: The Clock Inside You

  Lesson 3: Becoming a Champion

• Unit B: Home Is Where the Heat Is

  Chapter 4: Alien Invasion

  Lesson 1: Home Is Where the Heat Is

  Lesson 2: Alien Invasion

  Lesson 3: Would You Survive in Antarctica?

  Lesson 4: Diving to Rescue Coral Reefs

  Chapter 5: Ask Jimmy and the Bug

  Lesson 1: Ask Jimmy and the Bug

  Lesson 2: Diggin' Dirt

  Lesson 3: Deserts—What and Where

• Unit C: Deserts—What and Where

  Chapter 6: Don't Wash That Dirt Away

  Lesson 1: Deserts—What and Where

  Lesson 2: A Whole Lotta Rodent!

  Lesson 3: Don't Wash That Dirt Away

  Chapter 7: Diving to Rescue Coral Reefs

  Lesson 1: The Remarkable and Useful Date Palm

  Lesson 2: Sailing to the Stars

  Lesson 3: Diving to Rescue Coral Reefs

• Unit D: Don't Clean Your Room…

  Chapter 8: Exploring the Sahara

  Lesson 1: Icebergs: Floating Snow Cones

  Lesson 2: Did You Really See That?

  Lesson 3: Exploring the Sahara

  Chapter 9: Science Scoops: Pluto: A Planet or Not?

  Lesson 1: Blasting into Space

  Lesson 2: Science Scoops: Pluto: A Planet or Not?

  Lesson 3: Ask Jimmy and the Bug

  Chapter 10: Ask Jimmy and the Bug

  Lesson 1: Tidal Power—It's Out of This World

  Lesson 2: Exploring Space

  Lesson 3: Exploring Space

• Unit E: Ask Jimmy and the Bug

  Chapter 11: Snowballs in Summer

  Lesson 1: Snowballs in Summer

  Lesson 2: Snowballs in Summer

  Lesson 3: Ask Jimmy and the Bug

  Chapter 12: Ask Jimmy and the Bug

  Lesson 1: Ask Jimmy and the Bug

  Lesson 2: Ask Jimmy and the Bug

  Lesson 3: Ask Jimmy and the Bug

• Unit F: Sailing to the Stars

  Chapter 13: Harpo's World

  Lesson 1: Harpo's World

  Lesson 2: SURF'S UP in San Diego

  Lesson 3: What Is Lightning?

  Chapter 14: Ask Jimmy and the Bug

  Lesson 1: Sailing to the Stars

  Lesson 2: Old Cold: Living in Ice Age America

  Lesson 3: Ask Jimmy and the Bug

  Chapter 15: Stop It!

  Lesson 1: Putting Wings to Work

  Lesson 2: Stop It!

  Lesson 3: Harpo's World

Grade 4

• Unit A: The Lowly Lichen

  Chapter 1: Flashing Reds

  Lesson 1: The Lowly Lichen

  Lesson 2: Flashing Reds

  Chapter 2: Taking the Ultimate Plunge

  Lesson 1: Burning Carbs

  Lesson 2: Taking the Ultimate Plunge

  Lesson 3: Dancers on Wheels

  Chapter 3: How Long Can People Live?

  Lesson 1: Flashing Reds

  Lesson 2: How Long Can People Live?

  Lesson 3: Science Scoops: Forget Your Homework? Blame Mom!

  Chapter 4: Science Scoops: Lobsters Know the Way

  Lesson 1: Science Scoops: Lobsters Know the Way

  Lesson 2: Science Scoops: A “Chip” Off the Ol' Block

• Unit B: A Solution Takes Wing

  Chapter 5: Life Below Zero

  Lesson 1: Life Below Zero

  Lesson 2: Life Below Zero

  Lesson 3: Close Encounters in the Rain Forest

  Chapter 6: Close Encounters in the Rain Forest

  Lesson 1: Science Scoops: Crime Scene Insects

  Lesson 2: Science Scoops: Crime Scene Insects

  Chapter 7: What's the Fuss About Frogs?

  Lesson 1: A Solution Takes Wing

  Lesson 2: What's the Fuss About Frogs?

  Lesson 3: Stones & Bones: Jurassic Barf

• Unit C: Is Hawaii the Result of a Big Bang?

  Chapter 8: Glaciers: Incredible Frozen Time Machines

  Lesson 1: Science Scoops: Rocking the Earth

  Lesson 2: Is Hawaii the Result of a Big Bang?

  Lesson 3: Glaciers: Incredible Frozen Time Machines

  Chapter 9: S'more Energy, Please!

  Lesson 1: S'more Energy, Please!

  Lesson 2: What's So Special About HEVs?

  Lesson 3: What's So Special About HEVs?

• Unit D: Other Worlds, Other Storms

  Chapter 10: Weather Forecast for June 2263

  Lesson 1: It Isn't Always Best to Share

  Lesson 2: Floods

  Lesson 3: Weather Forecast for June 2263

  Lesson 4: Weather Forecast for June 2263

  Chapter 11: The Powers of Pressure

  Lesson 1: S'more Energy, Please!

  Lesson 2: Other Worlds, Other Storms

  Lesson 3: Power Bites: Plug into the Moon!

  Lesson 4: The Powers of Pressure

• Unit E: Science Scoops: Expansive Crystals

  Chapter 12: Fire and Ice

  Lesson 1: Science Scoops: Expansive Crystals

  Lesson 2: Fire and Ice

  Lesson 3: Science Scoops: War of the Roses

  Chapter 13: Candy Can Be a Gas!

  Lesson 1: Candy Can Be a Gas!

  Lesson 2: James Watt and the Bubbling Kettle

  Lesson 3: Bottled Bubbles

  Lesson 4: Burning Carbs

• Unit F: This Car Runs on Thin Air!

  Chapter 14: Biofuels: The Ultimate in Recycling

  Lesson 1: Biofuels: The Ultimate in Recycling

  Lesson 2: Science Scoops: Beam Me Up, Scotty!

  Lesson 3: Hear Ye! Hear Ye! Read All About It!

  Lesson 4: James Watt and the Bubbling Kettle

  Chapter 15: Power Bites: Personal Power

  Lesson 1: The “Electric Kiss”

  Lesson 2: Power Bites: Personal Power

  Lesson 3: How Maglevs Work

  Lesson 4: Do Sharks Have a Sixth Sense?

  Chapter 16: Perpetual Motion Quiz

  Lesson 1: Perpetual Motion Quiz

  Lesson 2: Perpetual Motion Quiz

  Lesson 3: This Car Runs on Thin Air!

Grade 5

• Unit A: The Secret World of Biological Warfare

  Chapter 1: Borrowing from Biology—Nature's Nanotechnology

  Lesson 1: Borrowing from Biology—Nature's Nanotechnology

  Lesson 2: The Secret World of Biological Warfare

  Lesson 3: Animal Angles: Life Form X

  Lesson 4: Borrowing from Biology—Nature's Nanotechnology

  Chapter 2: One Ugly Plant!

  Lesson 1: One Ugly Plant!

  Lesson 2: Pipelines and Pressure: The Story of Maple Syrup

  Lesson 3: One Ugly Plant!

  Chapter 3: Science Scoops: Does Having Boys or Girls Run in the Family?

  Lesson 1: Science Scoops: Does Having Boys or Girls Run in the Family?

  Lesson 2: Now You See It…Soon You Won't?

• Unit B: Now You See It…Soon You Won't?

  Chapter 4: “The Worms Crawl In, the Worms Crawl Out…”

  Lesson 1: “The Worms Crawl In, the Worms Crawl Out…”

  Lesson 2: Echoes of Greenland

  Lesson 3: “The Worms Crawl In, the Worms Crawl Out…”

  Chapter 5: Science Scoops: Killer Dust!

  Lesson 1: Science Scoops: Killer Dust!

  Lesson 2: Now You See It…Soon You Won't?

  Lesson 3: Science Scoops: Scientists Turn Down the Heat

• Unit C: What Makes the Generators Run?

  Chapter 6: A Lumpy Planet

  Lesson 1: Going Up: Life in the Death Zone

  Lesson 2: Science Scoops: Mount Everest Tops Itself

  Lesson 3: A Lumpy Planet

  Chapter 7: Science Scoops: What's in Vesuvius' Belly?

  Lesson 1: A Lumpy Planet

  Lesson 2: Science Scoops: What's in Vesuvius' Belly?

  Lesson 3: Science Scoops: What's in Vesuvius' Belly?

  Chapter 8: Science Scoops: Scientists Turn Down the Heat

  Lesson 1: Science Scoops: Scientists Turn Down the Heat

  Lesson 2: How Old Is Old?

  Lesson 3: What Makes the Generators Run?

• Unit D: The Worst Weather, the Best Place

  Chapter 9: Daniel Gropper Gauges the Weather

  Lesson 1: The Worst Weather, the Best Place

  Lesson 2: Daniel Gropper Gauges the Weather

  Chapter 10: Science Scoops: And…Reflections of Earth's Climate

  Lesson 1: The Great Eight

  Lesson 2: Science Scoops: And…Reflections of Earth's Climate

  Chapter 11: Science Scoops: Spacecraft Snaps Record Image

  Lesson 1: Science Scoops: Spacecraft Snaps Record Image

  Lesson 2: Science Scoops: Spacecraft Snaps Record Image

  Lesson 3: Stargazing with Jack Horkheimer

• Unit E: Science Scoops: Space-Age Polymer Sprays on Strength

  Chapter 12: Science Scoops: Slip-Sliding Away…No More?

  Lesson 1: Mitochondria: Powerhouses of the Cell

  Lesson 2: Science Scoops: Slip-Sliding Away…No More?

  Lesson 3: Science Scoops: Space-Age Polymer Sprays on Strength

  Chapter 13: Freezing Physics

  Lesson 1: A Big Fat Italian Dinner

  Lesson 2: Freezing Physics

  Lesson 3: Pipelines and Pressure: The Story of Maple Syrup

  Chapter 14: The Great Ice-Skating Competition

  Lesson 1: The Great Ice-Skating Competition

  Lesson 2: The Great Ice-Skating Competition

• Unit F: Oceans of Energy

  Chapter 15: Science Scoops: The World's Tiniest Thermometer

  Lesson 1: Science Scoops: Walk This Way!

  Lesson 2: Science Scoops: The World's Tiniest Thermometer

  Lesson 3: Circles in the Sky

  Chapter 16: Bouncing off the Walls

  Lesson 1: Oceans of Energy

  Lesson 2: Bouncing off the Walls

  Lesson 3: Science Scoops: And…Reflections of Earth's Climate

  Chapter 17: Generous Geothermals

  Lesson 1: Generous Geothermals

  Lesson 2: Animal Angles: Berry Interesting!

  Chapter 18: Blackout!

  Lesson 1: Blackout!

  Lesson 2: A “Bit” About Silicon

  Lesson 3: Blackout!

Grade 6

• Unit A: The Face of Immortality?

  Chapter 1: Science Scoops: Order! Order!

  Lesson 1: Science Scoops: Order! Order!

  Lesson 2: The Face of Immortality?

  Lesson 3: Animal Angles: War in the Animal Kingdom

  Chapter 2: The Science of Smallpox

  Lesson 1: The Face of Immortality?

  Lesson 2: The Science of Smallpox

  Lesson 3: The Science of Smallpox

  Chapter 3: Your DNA Profile: The Identity You Can't Escape

  Lesson 1: Amazing Migrations

  Lesson 2: Science Scoops: Black Cats Have Good Luck!

  Lesson 3: Your DNA Profile: The Identity You Can't Escape

  Chapter 4: Stones & Bones: Leapin' Lizards—Alligator Aerobics

  Lesson 1: Stones & Bones: Leapin' Lizards—Alligator Aerobics

  Lesson 2: What Is Serendipity?

• Unit B: Toad-ally Out of Control

  Chapter 5: The Soil…It's Alive!

  Lesson 1: Rescue! EMTs on the Job

  Lesson 2: The Soil…It's Alive!

  Lesson 3: Rebuilding the Food Pyramid

  Chapter 6: Animal Angles: Frogs' Friends

  Lesson 1: Squeezed to the Extreme

  Lesson 2: Animal Angles: Frogs' Friends

  Lesson 3: Toad-ally Out of Control

  Chapter 7: Animal Angles: Prairie Dogs Under Pressure

  Lesson 1: Animal Angles: Prairie Dogs Under Pressure

  Lesson 2: Science Scoops: Kilimanjaro Snowcap May Melt Soon

• Unit C: From the Ground Up

  Chapter 8: That Inner Glow

  Lesson 1: From the Ground Up

  Lesson 2: That Inner Glow

  Chapter 9: Making Mountains

  Lesson 1: Volcano!

  Lesson 2: Making Mountains

  Lesson 3: Making Mountains

  Chapter 10: Fowl Fuel

  Lesson 1: To Drill or Not to Drill

  Lesson 2: Fowl Fuel

• Unit D: What Really Causes the Ice Ages?

  Chapter 11: Eye on Hurricanes

  Lesson 1: Science Scoops: Stratospheric Memory!

  Lesson 2: What Really Causes the Ice Ages?

  Lesson 3: Eye on Hurricanes

  Chapter 12: What Causes the Tides?

  Lesson 1: Science Scoops: A Huge Eruption on the Sun!

  Lesson 2: Celestial Coincidence

  Lesson 3: What Causes the Tides?

  Chapter 13: The Planets That Aren't

  Lesson 1: The Planets That Aren't

  Lesson 2: Firestorm: Weather on a Neutron Star

• Unit E: Science Scoops: Fragrant Waste?

  Chapter 14: Make It Snow!

  Lesson 1: Iceland: Where Hydrogen Energy Is Hot!

  Lesson 2: Make It Snow!

  Lesson 3: Spinning Superstuff

  Lesson 4: Animal Angles: Frogs' Friends

  Chapter 15: Iceland: Where Hydrogen Energy Is Hot!

  Lesson 1: Snowball Art

  Lesson 2: Iceland: Where Hydrogen Energy Is Hot!

  Lesson 3: Science Scoops: Fragrant Waste?

• Unit F: Paint the Sky Blue

  Chapter 16: Power Bites: Celestial “Black Out”

  Lesson 1: Power Bites: Celestial “Black Out”

  Lesson 2: Paint the Sky Blue

  Lesson 3: When the Heavens Dance

  Chapter 17: Fiber-Optic Wonder

  Lesson 1: Riding the Electromagnetic Wave

  Lesson 2: Fiber-Optic Wonder

  Chapter 18: Riding the Electromagnetic Wave

  Lesson 1: When the Heavens Dance

  Lesson 2: Riding the Electromagnetic Wave

  Chapter 19: Flights of Fancy: Leonardo's Flying Machines

  Lesson 1: Springing Down the Street

  Lesson 2: Flights of Fancy: Leonardo's Flying Machines

  Lesson 3: Whirligig Science