Introspection and preserved writings give us far more insight into the ways of past humans than we have into the ways of past dinosaurs. For that reason I'm optimistic that we can eventually arrive at convincing explanations for these broadest patterns of human history.
Once in high school I completely over plucked my left eyebrow all the way up to where you're not supposed to. I had no idea what I was doing and it looked terrible! My mom was like 'What did you do to yourself?' I was so embarrassed.