I can't believe I haven't blogged about this yet.
A few years ago physicist Brian Greene created WorldScienceU, a free online classroom to teach science. The first course in physics is on Special Relativity, taught by Greene himself.
There are two versions of the course: the simple math-free version that allows you to understand the theory from a conceptual framework, and the full version which goes into all of the math. I've taken both courses, though I did skip most of the heavier math. There are several interactive features that allow you to play with spacetime diagrams and time dilation and length contraction to understand the ontology of the theory. If you complete the math course you basically understand the full theory, which is relatively easy. Ha!
Register now!
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