If you're into physics or chemistry at all, The Making of the Atomic Bomb has a ton of WW1 and WW2 history in it and a surprising amount of info on Hitler. It's really long but it's on Audible as well.
I think it's also just a side effect of their place in life. If you have disposable income already, a few thousand dollars is more disposable income. You can't picture what poverty is really like when you're a few thousand short on bills for the year every year and so you have to give up meals etc to make ends meet.
Yeah, the image (not mine, but the best I found quickly) kinda shows a rebase+merge as the third image. As the other commenter mentioned, the new commit in the second image is the merge commit that would include any conflict resolutions.
Merge takes two commits and smooshes them together at their current state, and may require one commit to reconcile changes. Rebase takes a whole branch and moves it, as if you started working on it from a more recent base commit, and will ask you to reconcile changes as it replays history.
I don't. Just commenting on the state of the system.