Free mini courses on engineering topics like finite elements and fluid dynamics, with interactive diagrams instead of walls of formulas.
Long, gorgeous interactive essays explaining how gears, cameras, GPS and light actually work.
An interactive 3D car you can take apart: engine, gearbox, brakes and suspension, each explained in plain English as it moves.
Pick a camera, lens, aperture and distance and watch the depth of field and background blur change on a sample photo.
See the chords and melody of thousands of pop songs laid out on a timeline, and learn why progressions work the way they do.
A search engine for online courses across every university and platform, with reviews and a list of the ones that are actually free.
