While it's not technically something I "learned", an idea presented in the interview with Stuart Firestein that I liked was the notion that science created ignorance. I like this idea because it's something I wouldn't really think about. No matter how far back you define the "start" of science, there's always the phenomenon of a discovery that is only known to a small subset of people. Even the simplest concepts of today were at one point seen as hidden knowledge, and even when they became known by a majority of the public, there's always that small percentage that has no idea of the concept. Even today, uncolonized tribes throughout the world have little to no knowledge of most technology and scientific discoveries. While I personally feel odd describing these groups as "ignorant", they do lack awareness to much of modern society. Although there are plenty of other things that could have caused the origin of ignorance, the idea that science is the culprit is one I enjoy!