Free science courses
55 science topics, each with a step-by-step guide and a free personalized course.
Understand how the world works, from cells and genes to stars, circuits and climate. These science guides cover biology, chemistry, physics, earth and space science and engineering, each with the math you need, the key ideas in a sensible order and experiments or observations you can do yourself. Learnr turns each one into short lessons with quizzes that make the concepts stick.
Every science course
- Learn Biology: Go from curious to fluent in how life actually works.
- Learn Chemistry: Go from memorizing to understanding how matter behaves.
- Learn Physics: Build real intuition for how the physical world works, one lesson at a time.
- Learn Astronomy: Understand the night sky and the universe behind it, one lesson at a time.
- Learn Organic Chemistry: Stop memorizing reactions and start predicting where the electrons go.
- Learn Anatomy: Learn the map of the human body, from the skeleton to the organs.
- Learn Genetics: From pea plants to CRISPR: how traits are stored, copied and passed on.
- Learn Neuroscience: Understand how billions of neurons turn into sensation, movement and memory.
- Learn Ecology: See how every organism fits into the web of life around it.
- Learn Microbiology: Meet the invisible organisms that run the planet and live inside you.
- Learn Earth Science: Understand the ground, air and water of the planet you live on.
- Learn Geology: Read the rocks under your feet like pages of Earth history.
- Learn Climate Science: Understand the physics and evidence behind a changing climate.
- Learn Quantum Physics: Learn what quantum mechanics actually says, minus the pop-science myths.
- Learn Electronics: Go from blinking your first LED to designing circuits that work.
- Learn Engineering: Learn to think like an engineer: define the problem, model it, build and test.
- Learn Botany: Learn how plants grow, feed themselves and reproduce, and how to name them.
- Learn Evolution: The idea that makes sense of all of biology, explained one step at a time.
- Learn Cell Biology: Look inside the smallest unit of life and see how it really works.
- Learn Biochemistry: The chemistry of life, from amino acids to the pathways that power cells.
- Learn Marine Biology: Explore life in the ocean from tide pools to hydrothermal vents.
- Learn Physiology: Understand how your body keeps itself running every second of the day.
- Learn Astrophysics: Use ordinary physics to read starlight and explain how stars live and die.
- Learn Cosmology: Follow the evidence for how the universe began, grew and what it is made of.
- Learn Thermodynamics: Understand heat, work and entropy, and why no engine can ever be perfect.
- Learn Electromagnetism: Go from static charges to Maxwell's equations and the nature of light.
- Learn Classical Mechanics: Predict how things move, from thrown balls to orbiting planets.
- Learn Optics: See how light bends, focuses and interferes, from eyeglasses to lasers.
- Learn Nuclear Physics: Explore the atomic nucleus, radioactivity and the energy of fission and fusion.
- Learn Relativity: Understand why moving clocks run slow and how mass curves spacetime.
- Learn Particle Physics: Meet the smallest building blocks of matter and the forces between them.
- Learn Inorganic Chemistry: Study the chemistry of the whole periodic table, from salts to metal complexes.
- Learn Analytical Chemistry: Find out what is in a sample and exactly how much, with numbers you can trust.
- Learn Physical Chemistry: Use physics and math to explain why reactions happen and how fast.
- Learn The Periodic Table: Know the elements by heart and understand why the table is shaped the way it is.
- Learn Immunology: See how your body tells self from invader and remembers past infections.
- Learn Virology: Discover how viruses are built, copy themselves and change over time.
- Learn Pharmacology: Learn how drugs move through the body and how they act on it.
- Learn Epidemiology: Learn how scientists track disease in populations and tell cause from coincidence.
- Learn Zoology: From sponges to primates: how animals are built, classified and how they behave.
- Learn Entomology: Six legs, three body parts, and the most diverse group of animals on Earth.
- Learn Mycology: The hidden kingdom of molds, yeasts, mushrooms and the mycelium beneath them.
- Learn Paleontology: Read the history of life from bones, shells, footprints and the rocks that hold them.
- Learn Meteorology: Understand the atmosphere well enough to read the sky and the forecast map.
- Learn Oceanography: The physics, chemistry, geology and biology of the ocean, in one connected picture.
- Learn Environmental Science: How natural systems work and how human activity changes air, water, soil and life.
- Learn Renewable Energy: How sunlight, wind, water and heat become electricity, and how the grid keeps up.
- Learn Robotics: Sense, think, act: build machines that perceive the world and move through it.
- Learn Aerospace Engineering: The physics and engineering behind aircraft, rockets and spacecraft.
- Learn Electrical Engineering: From Ohm's law to signals and power systems, the engineering of electricity.
- Learn Mechanical Engineering: Forces, motion, heat and machines, and how engineers design things that hold up.
- Learn Civil Engineering: The engineering of bridges, buildings, roads, water and the ground beneath them.
- Learn Chemical Engineering: Turn chemistry in a flask into safe, efficient processes at industrial scale.
- Learn Materials Science: Why steel bends, glass shatters and plastic stretches, explained from the atoms up.
- Learn Forensic Science: The real science of evidence, from the crime scene to the lab report and the courtroom.
Don't see what you want?
Type any topic and Learnr builds a course for it. .