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Subject sequences open source-grounded AI help, manual progress, and visible completion gates inside each lesson.
astronomy
View sequence
Telescopes: Types and Their Uses in Astronomy
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The Hertzsprung-Russell Diagram: Classifying Stars
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Seasons: Causes and Effects on Earth
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The International Space Station: Purpose and Research
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Future of Astronomy: Emerging Technologies and Missions
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Dark Matter and Dark Energy: Concepts and Evidence
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The Scale of the Universe: Distances and Measurement Units
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The Sun: Structure and Importance
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Stars: Formation and Life Cycle
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Astronomy Concept 40: The Life Cycle of Stars
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Binary Star Systems: Types and Dynamics
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Exoplanets: Discovery and Characteristics
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Tides: Gravitational Influence of the Moon and Sun
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The Role of Satellites in Astronomy
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Space Weather: Solar Flares and Their Impact
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Gravity and Orbits: What Holds the Solar System Together
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Measuring Cosmic Scale: From Light-Years to the Universe
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Moon Phases and Eclipses: Geometry of Light and Shadow
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Gravity and the Solar System: What Keeps Worlds in Orbit
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Why the Sky Moves: Earth's Daily Spin and Yearly Orbit
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Starlight Detective: Reading Messages From Distant Stars
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Eclipses Happen When Sun, Earth, and Moon Align
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Light Beyond Visible Reveals Hidden Astronomy
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Gravity Keeps Planets and Moons in Orbit
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Stars Are Born, Live, and Die Over Time
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Light-Years Measure the Vast Distances to Stars
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Farther Planets Take Longer to Orbit the Sun
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The Sun Lives in the Milky Way Galaxy
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biology
View sequenceIntroduction to Microorganisms
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Circulatory System Basics
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Viruses: Characteristics and Life Cycle
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Carbon Cycle and Its Impact
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Characteristics of Living Things
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Endangered Species and Conservation Efforts
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Symbiosis: Mutualism, Commensalism, Parasitism
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Mitosis and the Cell Cycle
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anatomy physiology
View sequenceEthical Considerations in Human Anatomy Studies
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Blood Pressure and Pulse
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The Skin’s Role in Temperature Regulation
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Hormonal Regulation of Growth
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The Structure and Function of DNA
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Structure and Function of Cells
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Levels of Organization in the Human Body
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chemistry
View sequenceTypes of Chemical Reactions: Synthesis
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Chemical Bonds: Ionic and Covalent Bonding Explained
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Density and Its Calculation
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Introduction to Functional Groups in Organic Chemistry
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Atoms and Elements: Understanding the Basic Building Blocks of Matter
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Environmental Chemistry: Pollution and Recycling
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Chemical Reactions: Identifying Reactants, Products, and Reaction Types
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civics government
View sequenceThe Electoral Process: Voting and Elections
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The Role of Media in Government
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Federal Government: Overview and Functions
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How Public Policy is Made
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How Political Campaigns Work
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The Role of Police and Law Enforcement
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The Process of Impeachment
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engineering making
View sequenceIntroduction to Mechatronics
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Introduction to CAD Simulation and Analysis
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Introduction to Structural Analysis and Stress
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Using Tools Safely: Hand and Power Tools
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Introduction to Computer-Aided Design (CAD)
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Basics of Wireless Communication for Engineering
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Mechanical Systems: Springs and Shock Absorbers
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history
View sequenceThe American Revolution: Causes and Outcomes
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The French Revolution and Its Significance
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The Causes and Effects of the Protestant Reformation
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Imperialism and the Scramble for Africa
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Causes and Major Events of World War II
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Ancient Civilizations: The Indus Valley
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Exploration and the Age of Discovery
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Understanding Timelines and Chronology
law legal
View sequenceThe Role of International Law
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How to Read and Interpret a Law
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How to Analyze a Legal Case
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Legal Documents: Wills, Deeds, and Power of Attorney
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Difference Between Statutory and Common Law
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Understanding Intellectual Property Law
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The Concept of Legal Capacity
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The Importance of Legal Research
math
View sequenceRational Expressions and Equations
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Using the Distributive Property
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Area of Parallelograms and Trapezoids
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Transformations: Translations
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Solving Systems of Linear Equations by Graphing
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Absolute Value
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Pythagorean Theorem
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Quadratic Expressions and Equations
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medicine clinical
View sequenceCommon Genetic Disorders and Their Impact
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The Muscular System: Types and Functions
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Introduction to Surgery: Tools and Procedures
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Understanding Allergies and Immune Responses
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The Nervous System: Brain and Nerves
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Basics of Common Diseases and Preventive Healthcare
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Understanding Tissues and Organs
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music
View sequenceScales: Major and Minor
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Simple Counterpoint Concepts
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Using Ledger Lines to Read High and Low Notes
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Using Technology for Music Composition
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Understanding Syncopation and Off-Beat Rhythms
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Intervals: Recognizing and Naming
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Texture in Music: Monophony, Homophony, and Polyphony
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Introduction to Modes: Dorian and Mixolydian
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philosophy ethics
View sequenceThe Importance of Honesty
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Introduction to Ethical Theories
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Philosophy of Religion: Belief and Doubt
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Courage and Moral Strength
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Justice: Fairness and Equality
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Branches of Philosophy: Overview
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The Mind-Body Problem: What is Consciousness?
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physics
View sequenceSpeed and Velocity
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Thermal Expansion of Solids, Liquids, and Gases
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Atmospheric Pressure and Weather Effects
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Renewable and Non-renewable Energy
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Refraction of Light: Causes and Effects
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Mass and Weight
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Environmental Impact of Energy Use
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Acceleration and Deceleration
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reading
View sequenceSynthesizing Information from Multiple Texts
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Skimming and Scanning Strategies for Efficient Reading
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Distinguishing Fact from Opinion in Texts
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Supporting Details: Recognizing Evidence that Supports the Main Idea
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Evaluating Arguments and Evidence in Texts
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Reading and Interpreting Dialogue
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Identifying Author's Purpose: Inform, Persuade, Entertain
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Theme Identification: Discovering the Central Message or Moral
social studies
View sequenceGovernment Systems: Democracy, Monarchy, and Dictatorship
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Introduction to Trade and Barter Systems
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Historical Timelines and Chronology
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Forms of Government: Democracy and Monarchy
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The Rise and Fall of Empires
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Natural Resources and Conservation
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Industrial Revolution: Causes and Impact
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computer science
View sequenceLoops: For and While
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Convert Decimal to Binary
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Match Software Types and Operating Systems
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Design a Simple Algorithm to Find the Largest Number
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Make Your Webpage Interactive with JavaScript
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Control an Embedded LED
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Basic Arithmetic Operations in Programming
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