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Start from the beginning.
Pick a course and take its units in order. Each unit is a few short lessons around a live Scene, and its practice questions check your answer as you go. Your progress stays in this browser.
19 units · 75 lessons
Mathematics
Numbers first, then algebra, functions, geometry and trigonometry, each idea built on the one before.
- Numbers
- Ratio and scale
- Algebraic expressions
- Linear equationsand 15 more
30 units · 140 lessons
Physics
From a falling ball to a burning star: motion, forces, energy, waves and electricity, to high-school level.
- Measurement
- Motion in a line
- Projectile motion
- Forcesand 26 more
12 units · 53 lessons
Chemistry
What things are made of and how they change: atoms, bonds, reactions, acids and carbon, to high-school level.
- Atoms and elements
- Bonding and structure
- The mole
- Reactions and equationsand 8 more
10 units · 41 lessons
Computer science
How a machine of switches sorts, searches, keeps secrets and learns, from bits and logic gates to machine learning.
- Bits and data
- Logic gates
- How a computer runs a program
- Algorithms and efficiencyand 6 more
14 units · 71 lessons
Biology
Life from the single cell up: genes, evolution, the body, disease, plants and ecology, to high-school level.
- Cells and life
- The molecules of life
- Transport in cells
- Energy in living thingsand 10 more