Nearly six years ago, I sat down at my desk and typed up a detailed guide for anyone who wanted to learn physics on their own. At the time, I had no idea how many people would read it and use it — my only goal was to put the information out there in a clear and straightforward way so that anyone who wanted to learn physics would have the self-study curriculum they needed. Since then, over six hundred thousand people have turned to this guide to study physics.

Nearly six years ago, I sat down at my desk and typed up a detailed guide for anyone who wanted to learn physics on their own. At the time, I had no idea how many people would read it and use it — my only goal was to put the information out there in a clear and straightforward way so that anyone who wanted to learn physics would have the self-study curriculum they needed. Since then, over six hundred thousand people have turned to this guide to study physics.