The Basics You Need
Einstein's Theory of Relativity — Without the Formulas
Prerequisites: the speed of light as a constant, inertial frames, what 'relative' actually means in physics. Introduces the GPS anchor.
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Learning Material
5 pagesLesson 3 — The Basics You Need
Understanding the Complex: Einstein's Theory of Relativity — Without the Formulas
If you already know what an inertial reference frame is, what it means for the speed of light to be constant, and what "relative" actually means in physics, skim this lesson — you'll encounter everything again in Lessons 4 and 5.
For everyone else: this lesson covers the four concepts that make the next three lessons work. No more than that.