Key Points from Chapter 2:


 


If you are enjoying getting your head around special relativity, you might want to have a look at the Appendix to this Chapter. This gets into the theory in a little bit more depth and looks at some of the issues it raises, including the famous twin paradox.

 

The appendix is, however, an optional extra: You don’t need it to progress to chapter 3 and beyond:  so if you’re in a hurry to find out why E is equal to mc2 or to get stuck into quantum theory, feel free to skip it.