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Subject sequences open source-grounded AI help, manual progress, and visible completion gates inside each lesson.
astronomy
View sequence
The Role of Gravity in Space
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Comets, Asteroids, and Meteors
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The Sun: Our Closest Star
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The Big Bang Theory Simplified
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What Are Stars?
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The Concept of Orbit and Satellites
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What Are Galaxies?
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How We Use Space to Predict Weather
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The Earth’s Rotation and Revolution
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Famous Astronomers and Their Discoveries
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Exploring Mars and Other Planets
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Astronomy Concept 40: Understanding Black Holes
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The Milky Way Galaxy
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How Light Travels in Space
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Phases of the Moon and Tides
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The Importance of Satellites
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Sun, Earth, Moon, and the Shadows They Make
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Meet the Sun and Its Eight Planets in Order
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Why Some Stars Look Brighter Than Others
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Day and Night: Our Spinning Earth
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How We Know: Telescopes and Evidence
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Earth's Spin Makes Day Turn Into Night
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Moon Phases Come From Sunlight and Position
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Why the Moon Seems to Change Shape
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Other Travelers of the Solar System
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Rocky Inner Planets and the Giant Outer Planets
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Earth's Tilt Changes How Sunlight Hits Us, Making Seasons
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Why the Sun Seems to Move Across the Sky
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Telescopes Collect Light to See Faint Objects
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The Eight Planets in Order From the Sun
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The Speed of Light and Distance in Space
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biology
View sequenceWhat Are Living Things? Exploring Characteristics of Life with Lily the Ladybug
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Parts of a Plant
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Animal Habitats and Adaptations: How Benny the Beaver Builds His Home
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What Are Animals Made Of? (Body Parts and Functions)
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Introduction to Insects
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Plant Parts and Their Jobs: Discovering Roots, Stems, and Leaves with Sam the Sunflower
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Simple Genetics: Traits from Parents
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What Are Living Things?
anatomy physiology
View sequenceThe Skeletal System: Bones and Their Functions
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How Food Helps Our Body Grow
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How Growth Plates Help Bones Grow
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How Our Body Uses Energy
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Joints and Movement
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Body Temperature and How We Stay Warm
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Introduction to the Human Body
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chemistry
View sequenceFamous Chemist Characters and Their Discoveries
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Introduction to Atoms: The Building Blocks
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Properties of Matter: Texture, Color, and Shape
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Why Do Things Float or Sink? Density Basics
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States of Water: Ice, Water, and Steam Experiments
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Introduction to Acids and Bases with Everyday Items
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States of Matter: Solids, Liquids, and Gases
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civics government
View sequenceRights and Responsibilities of Citizens
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How to Solve Problems Peacefully
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Why We Respect Rules at Home and School
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What is a President?
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The Role of Leaders in Our Community
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The Role of Schools in a Community
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How Taxes Help Our Community
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engineering making
View sequenceBasics of Wheels and Axles
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Introduction to Sensors: Light and Sound
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Exploring Inclined Planes
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Collaborative Engineering: Working in Teams
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Making Paper Airplanes and Testing Designs
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Designing for Recycling and Reuse
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Designing and Building Windmills
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history
View sequenceThe History of Pirates: Fact and Fiction
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Medieval Castles and Knights
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The Roman Empire: Gladiators and Emperors
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The History of Ancient Mesopotamia
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Ancient Egypt: Life by the Nile
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The Story of Anne Frank
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The Story of Rosa Parks
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Famous Women in History: Amelia Earhart
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law legal
View sequenceHow to Solve Disagreements Peacefully
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What is Evidence?
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What is Bullying and How Does the Law Help?
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Voting and Making Choices
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Respecting Others’ Rights
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What is a Law?
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What is a Witness?
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Consequences of Breaking Rules
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math
View sequenceUnderstanding and Using Parentheses in Expressions
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Introduction to Data: Collecting and Organizing Data
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Introduction to Area: Counting Squares
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Basic Addition with Carrying
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Using a Number Line for Addition and Subtraction
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Introduction to Area with Square Units
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Introduction to Median and Mode
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Understanding and Measuring Perimeter
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music
View sequencePlaying Simple Songs on a Keyboard
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Composing a Short Song with Lyrics
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Understanding Time Signatures
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Learning Basic Musical Symbols
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Understanding High and Low Sounds
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Understanding Verse and Chorus Structure
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philosophy ethics
View sequenceMaking Decisions: Thinking About Consequences
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What Does It Mean to Be Brave?
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Respecting Differences: Learning About Diversity
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Listening to Different Opinions
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Understanding Empathy: Walking in Someone Else’s Shoes
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Understanding Right and Wrong
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Thinking About Fairness
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physics
View sequenceStates of Matter Changes: Melting, Freezing, Evaporation
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Forces and Motion: How Pushes and Pulls Move Things
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Balance and Equilibrium: How Things Stay Steady
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Vibrations and Waves: The Basics of Sound
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Measuring Time and Motion with Stopwatches
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Using Graphs to Show Motion
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What Is Matter? Understanding Solids, Liquids, and Gases
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Energy: What Is It and Where Does It Come From?
social studies
View sequencecomputer science
View sequenceWhat is a Computer?
coding exercises · en
Animate a Bouncing Ball
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Loop Your Way Through a Pattern
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Understanding Hardware vs Software
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Create Your First Chatbot
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Build Your Own Multi-Level Adventure Game
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Introduction to HTML and Web Pages
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Create Your Own Colorful Animal Portrait
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Create Your Own Colorful Animal Scene
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Create Your Own Colorful Garden Scene
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Atlas Matches Art Tools
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Atlas Sorts Warm and Cool Colors
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Atlas Sorts Art Supplies by Size
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Atlas Counts Dots in a Painting
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Create Your Own Colorful Garden Scene
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coding
View sequencewriting
View sequencereading
View sequencescience
View sequencelaw legal reasoning
View sequenceSame Rule for Everyone, Even the Boss
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Two Sides of the Same Coin: Rights and Responsibilities
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From Rules to Laws: Who Makes Them and Where They Apply
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Rules: What They Are and Why Groups Need Them
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Consequences That Fit: Making Things Fair Again
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Hearing Both Sides Before You Decide
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medicine clinical
View sequenceSignals That Tell Us We're Not Well
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Stopping Sickness Before It Starts
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The Four Helpers That Keep You Healthy
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Germ Detectives: How Tiny Bugs Spread
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How Medicine and Care Help Us Heal
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Vital Signs: Numbers That Show How Your Body Is Doing
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mathematics
View sequenceHow Place Tells a Digit's Value
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Fractions Name Equal Parts of a Whole
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Multiplication as Equal Groups
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Area: Covering Rectangles with Unit Squares
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Decimals as Tenths and Hundredths
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Different Fractions That Are Equal
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Locating Points with Two Coordinates
language
View sequenceTell a Fact Apart From an Opinion
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Use Nearby Words to Figure Out a New Word
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Four Kinds of Sentences for Four Jobs
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Find the Main Idea and Its Details
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Prefixes Change What a Word Means
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Subjects and Verbs Must Match
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Suffixes Change a Word's Job
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