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Follow a path — Sequences that build one course on the last.
Physics · 4 modules · 11 lessons
Journey from the night sky to the edge of the cosmos — seasons and eclipses, planets and moons, the lives and deaths of stars, galaxies, and the expanding universe, all built on real observations.
Computer Science · 4 modules · 11 lessons
Turn raw data into trustworthy answers — sampling, wrangling, visualization, probability, and the machine-learning workflow, taught with real Python and honest uncertainty.
Mathematics · 4 modules · 11 lessons
Master functions, graphs, and trigonometry — the complete bridge from algebra to your first calculus course, with worked examples and self-check quizzes.
History · 4 modules · 12 lessons
A genuinely global survey from the first farmers to 1500 — Mesopotamia and Rome, but equally the Maurya and Tang empires, the Islamic caliphates, Mali, Great Zimbabwe, and the Aztec and Inca.
Medicine · 4 modules · 12 lessons
The standard first-semester A&P course: body organization, homeostasis, tissues, and the integumentary, skeletal, muscular, and nervous systems, for nursing and allied-health students.
Physics · 4 modules · 12 lessons
Master the physics of charge, current, and magnetism — from Coulomb's law to Maxwell's equations — with worked examples, real circuits, and the field concept that unifies it all.
Mathematics · 4 modules · 12 lessons
Continue past the derivative with techniques of integration, applications, differential equations, sequences and series, and parametric and polar curves.
Philosophy · 4 modules · 12 lessons
Think clearly about life's deepest questions — knowledge, reality, mind, and morality — through the arguments, thought experiments, and great debates that built the Western philosophical tradition.
Biology · 4 modules · 12 lessons
Explore life from the ground up — the chemistry of water, the four macromolecules, cells and membranes, energy, DNA, and the genetics of inheritance — with worked crosses and clear molecular detail.
Economics · 4 modules · 12 lessons
Understand the whole economy — GDP, inflation, unemployment, the business cycle, government budgets, and the Federal Reserve — through worked examples, real-world cases, and curated videos.
Chemistry · 4 modules · 12 lessons
Build a rock-solid foundation in chemistry — from atoms and the periodic table to bonding, molecular shapes, and the stoichiometry behind every reaction — with worked problems throughout.
Physics · 4 modules · 12 lessons
Master the physics of motion — from falling apples to spinning skaters — with worked examples, real numbers, and the laws that run the mechanical world.
Economics · 4 modules · 12 lessons
Master how markets really work — scarcity, supply and demand, elasticity, taxes, and monopoly — through worked examples, real-world cases, and curated videos.
Psychology · 4 modules · 12 lessons
Explore how the mind works and why we behave as we do — a complete first course in psychology, from neurons and memory to social influence and mental health.
Mathematics · 4 modules · 12 lessons
Learn to describe data, reason with probability, and draw defensible conclusions from samples — with fully worked examples in every lesson.
Computer Science · 4 modules · 12 lessons
Learn to think like a programmer and write real Python — variables, loops, functions, and data structures — with zero prior experience required.
Mathematics · 4 modules · 11 lessons
Master limits, derivatives, and integrals from first principles — a complete first-semester calculus course with worked examples and self-check quizzes.
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