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Explore 324 focused topics across 26 categories, from school and workplace skills to entertainment, hobbies, health, travel, and everyday life.

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Showing 97-120 of 324

French Conversation

Build practical understanding of spoken French, listening strategies, pronunciation, and useful sentence patterns, then use it for introductions, travel, daily routines, and social conversation.

  • Explain the main ideas and vocabulary involved in spoken French, listening strategies, pronunciation, and useful sentence patterns
  • Follow a repeatable process for introductions, travel, daily routines, and social conversation
Beginner to intermediate
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Arabic Foundations

Build practical understanding of Arabic sounds, script, core expressions, and simple sentence building, then use it for greetings, personal information, signs, and everyday exchanges.

  • Explain the main ideas and vocabulary involved in Arabic sounds, script, core expressions, and simple sentence building
  • Follow a repeatable process for greetings, personal information, signs, and everyday exchanges
Beginner to intermediate
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Mandarin Foundations

Build practical understanding of Mandarin tones, pinyin, common characters, and high-frequency phrases, then use it for introductions, numbers, routines, directions, and daily conversation.

  • Explain the main ideas and vocabulary involved in Mandarin tones, pinyin, common characters, and high-frequency phrases
  • Follow a repeatable process for introductions, numbers, routines, directions, and daily conversation
Beginner to intermediate
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Business Communication

Build practical understanding of clear professional writing, listening, meetings, and audience-aware tone, then use it for emails, updates, proposals, presentations, and workplace conversations.

  • Explain the main ideas and vocabulary involved in clear professional writing, listening, meetings, and audience-aware tone
  • Follow a repeatable process for emails, updates, proposals, presentations, and workplace conversations
Beginner to intermediate
Explore Business Communication

Arithmetic and Numeracy

Build practical understanding of number sense, operations, estimation, fractions, decimals, and percentages, then use it for everyday calculations, comparisons, measurement, and checking reasonableness.

  • Explain the main ideas and vocabulary involved in number sense, operations, estimation, fractions, decimals, and percentages
  • Follow a repeatable process for everyday calculations, comparisons, measurement, and checking reasonableness
School to university foundations
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Geometry Fundamentals

Build practical understanding of shape properties, angle relationships, measurement, similarity, and spatial reasoning, then use it for diagrams, constructions, perimeter, area, volume, and geometric proof.

  • Explain the main ideas and vocabulary involved in shape properties, angle relationships, measurement, similarity, and spatial reasoning
  • Follow a repeatable process for diagrams, constructions, perimeter, area, volume, and geometric proof
School to university foundations
Explore Geometry Fundamentals

Trigonometry

Build practical understanding of right triangles, radians, unit-circle relationships, identities, and periodic functions, then use it for finding unknown measures, modeling cycles, and solving spatial problems.

  • Explain the main ideas and vocabulary involved in right triangles, radians, unit-circle relationships, identities, and periodic functions
  • Follow a repeatable process for finding unknown measures, modeling cycles, and solving spatial problems
School to university foundations
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Linear Algebra

Build practical understanding of vectors, matrices, linear systems, transformations, and vector spaces, then use it for solving systems, representing transformations, and modeling multidimensional data.

  • Explain the main ideas and vocabulary involved in vectors, matrices, linear systems, transformations, and vector spaces
  • Follow a repeatable process for solving systems, representing transformations, and modeling multidimensional data
School to university foundations
Explore Linear Algebra

Discrete Mathematics

Build practical understanding of logic, sets, combinatorics, graphs, recursion, and finite structures, then use it for counting possibilities, modeling networks, and reasoning about algorithms.

  • Explain the main ideas and vocabulary involved in logic, sets, combinatorics, graphs, recursion, and finite structures
  • Follow a repeatable process for counting possibilities, modeling networks, and reasoning about algorithms
School to university foundations
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Number Theory

Build practical understanding of divisibility, primes, modular arithmetic, patterns, and integer reasoning, then use it for proof problems, coding ideas, and structured mathematical exploration.

  • Explain the main ideas and vocabulary involved in divisibility, primes, modular arithmetic, patterns, and integer reasoning
  • Follow a repeatable process for proof problems, coding ideas, and structured mathematical exploration
School to university foundations
Explore Number Theory

Mathematical Proof

Build practical understanding of definitions, implications, counterexamples, induction, contradiction, and rigorous argument, then use it for turning observations into valid proofs and reviewing gaps in reasoning.

  • Explain the main ideas and vocabulary involved in definitions, implications, counterexamples, induction, contradiction, and rigorous argument
  • Follow a repeatable process for turning observations into valid proofs and reviewing gaps in reasoning
School to university foundations
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Financial Mathematics

Build practical understanding of percent change, compound growth, present value, rates, and payment models, then use it for comparing loans, savings plans, investments, and long-term financial choices.

  • Explain the main ideas and vocabulary involved in percent change, compound growth, present value, rates, and payment models
  • Follow a repeatable process for comparing loans, savings plans, investments, and long-term financial choices
School to university foundations
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Electricity and Magnetism

Build practical understanding of charge, fields, circuits, magnetic forces, induction, and electromagnetic models, then use it for analyzing circuits, field diagrams, motors, generators, and electrical systems.

  • Explain the main ideas and vocabulary involved in charge, fields, circuits, magnetic forces, induction, and electromagnetic models
  • Follow a repeatable process for analyzing circuits, field diagrams, motors, generators, and electrical systems
Secondary school to university foundations
Explore Electricity and Magnetism

Thermodynamics

Build practical understanding of temperature, energy transfer, work, entropy, and system boundaries, then use it for reasoning about engines, phase changes, efficiency, and thermal processes.

  • Explain the main ideas and vocabulary involved in temperature, energy transfer, work, entropy, and system boundaries
  • Follow a repeatable process for reasoning about engines, phase changes, efficiency, and thermal processes
Secondary school to university foundations
Explore Thermodynamics

Waves and Optics

Build practical understanding of wave behavior, sound, light, interference, diffraction, and image formation, then use it for interpreting wave diagrams, lenses, mirrors, signals, and resonance.

  • Explain the main ideas and vocabulary involved in wave behavior, sound, light, interference, diffraction, and image formation
  • Follow a repeatable process for interpreting wave diagrams, lenses, mirrors, signals, and resonance
Secondary school to university foundations
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Quantum Physics Concepts

Build practical understanding of quantization, probability, wave-particle behavior, measurement, and atomic models, then use it for interpreting foundational experiments without losing the limits of each model.

  • Explain the main ideas and vocabulary involved in quantization, probability, wave-particle behavior, measurement, and atomic models
  • Follow a repeatable process for interpreting foundational experiments without losing the limits of each model
Secondary school to university foundations
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Organic Chemistry

Build practical understanding of carbon structures, functional groups, bonding, reactions, and mechanism patterns, then use it for naming compounds, predicting products, and explaining reaction pathways.

  • Explain the main ideas and vocabulary involved in carbon structures, functional groups, bonding, reactions, and mechanism patterns
  • Follow a repeatable process for naming compounds, predicting products, and explaining reaction pathways
Secondary school to university foundations
Explore Organic Chemistry

Biochemistry

Build practical understanding of biomolecules, enzymes, metabolism, energy transfer, and molecular interactions, then use it for connecting molecular structure with cellular function and biological evidence.

  • Explain the main ideas and vocabulary involved in biomolecules, enzymes, metabolism, energy transfer, and molecular interactions
  • Follow a repeatable process for connecting molecular structure with cellular function and biological evidence
Secondary school to university foundations
Explore Biochemistry

Laboratory Skills

Build practical understanding of measurement, variables, controls, uncertainty, safety, and scientific records, then use it for planning experiments, collecting reliable data, and evaluating results.

  • Explain the main ideas and vocabulary involved in measurement, variables, controls, uncertainty, safety, and scientific records
  • Follow a repeatable process for planning experiments, collecting reliable data, and evaluating results
Secondary school to university foundations
Explore Laboratory Skills

Scientific Method and Reasoning

Build practical understanding of questions, hypotheses, models, evidence, replication, and uncertainty, then use it for designing fair investigations and judging the strength of scientific claims.

  • Explain the main ideas and vocabulary involved in questions, hypotheses, models, evidence, replication, and uncertainty
  • Follow a repeatable process for designing fair investigations and judging the strength of scientific claims
Secondary school to university foundations
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Human Anatomy and Physiology

Build practical understanding of body structures, organ systems, regulation, and structure-function relationships, then use it for reading anatomical diagrams and explaining how body systems interact.

  • Explain the main ideas and vocabulary involved in body structures, organ systems, regulation, and structure-function relationships
  • Follow a repeatable process for reading anatomical diagrams and explaining how body systems interact
Secondary school to university foundations
Explore Human Anatomy and Physiology

Ecology and Evolution

Build practical understanding of populations, selection, adaptation, biodiversity, and ecological interactions, then use it for explaining change across generations and patterns within ecosystems.

  • Explain the main ideas and vocabulary involved in populations, selection, adaptation, biodiversity, and ecological interactions
  • Follow a repeatable process for explaining change across generations and patterns within ecosystems
Secondary school to university foundations
Explore Ecology and Evolution

Microbiology

Build practical understanding of microbial cells, growth, transmission, immunity, and useful microorganisms, then use it for interpreting cultures, infection pathways, and microbiome relationships.

  • Explain the main ideas and vocabulary involved in microbial cells, growth, transmission, immunity, and useful microorganisms
  • Follow a repeatable process for interpreting cultures, infection pathways, and microbiome relationships
Secondary school to university foundations
Explore Microbiology

Botany and Plant Science

Build practical understanding of plant structure, photosynthesis, transport, reproduction, and environmental responses, then use it for identifying plant processes and interpreting growth observations.

  • Explain the main ideas and vocabulary involved in plant structure, photosynthesis, transport, reproduction, and environmental responses
  • Follow a repeatable process for identifying plant processes and interpreting growth observations
Secondary school to university foundations
Explore Botany and Plant Science

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Open a topic to see what you can learn, questions worth asking, relevant activity decks, and pals suited to the interest. You can try a text conversation first, then create a member profile to save progress, schedule hangouts, or continue by voice.