Sapiens: A Brief History of Humankind

Somewhere between a 4 and a 5. I think I got a bit bored partway through, and it took me a couple of months to come back and finish it off. Most interesting part for me was how a lot of things in human society are imaginary (like money, the concept of a company, etc) but we all buy into them being real, and so that's what makes it “real”.