Appendix
If you ever read Lord of the Rings, you know that about a third of the third volume, The Return of the King, consists of appendices to enhance the story you’ve just read.
The purpose of the following is to help enhance your physics work this summer. If you’ve gone through The C++ Path, The Python Path, or The RDataframe Path, you’ve got some time left, and you don’t feel ready to proceed to the Advanced Exercises, then feel free to browse through the following.
Most of this is not about ROOT itself, but these sections may help better prepare you for your upcoming research. 1
Footnotes
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Unlike the appendices in The Lord of the Rings, you’re not likely to learn much about Hobbits or the Downfall of Númenor. Sorry, but there are limits, even for me.

Figure 142: https://xkcd.com/847/ by Randall Munroe