David Neves said:
If you are stunned that someone could think that, remember that that is the case for subjects other than physics.
I like a lot of this post, but not this particular assertion; so I want to take a little time to dispute it in hopes this will bring out some real considerations about what ignorance has come to mean in our time. To start with, getting a simplified answer about who Cromwell does not create "basic awareness" if the person asking has no context for the answer, as in the example. A disconnected fragment is a disconnected fragment, whether the subject is history or physics.
I would go further & say that sometimes persons in the hard sciences, proud of the difficulty of what they do, fail to appreciate that the "soft" disciplines of history, economics, sociology, etc. etc., are similarly abstruse and demanding, albeit along different lines. As an example, occasionally arguments develop in the General Discussion forum among members with credentials in physics or math etc., who from their tone seem to believe these credentials qualify them to issue expert opinions on economic or social issues they haven't studied with any more rigor than the average member of the public. This is as opposed to members who
have studied or otherwise know a good deal in one or another field outside of hard science, and who are careful to cite sources & evidence, qualify their remarks, etc.
I'm currently reading a 2017 book,
http://www.penguinrandomhouse.com/books/533524/the-knowledge-illusion-by-steven-sloman-and-philip-fernbach/9780399184352/, by cognitive scientists Steven Sloman and Philip Fernbach. The book explores the fact that human knowledge is necessarily communal in nature; for their examples, the authors draw upon engineering, physics, economics, and history among other disciplines. They make the point that outside our own fields, we often know very little; but we think we know a lot because our culture supports this illusion (with Google making things worse). Here is a long excerpt from early in the book that makes the same point I made above about history - i.e. that a one-sentence answer about Cromwell is apt to be meaningless to most of us:
The Japanese attacked Pearl Harbor on December 7, 1941. The world was at war, Japan was an ally of Germany, and while the United States was not yet a participant, it was clear whose side it was on— the heroic Allies and not the evil Axis. These facts surrounding the attack are familiar and give us a sense that we understand the event. But how well do you really understand why Japan attacked, and specifically why they attacked a naval base on the Hawaiian Islands? Can you explain what actually happened and why?
It turns out that the United States and Japan were on the verge of war at the time of the attack. Japan was on the march, having invaded Manchuria in 1931, massacred the population of Nanking, China, in 1937, and invaded French Indochina in 1940. The reason that a naval base even existed in Hawaii was to stop perceived Japanese aggression. U.S. president Franklin D. Roosevelt moved the Pacific Fleet to Hawaii from its base in San Diego in 1941.
So an attack by Japan was not a huge surprise. According to a Gallup poll, 52 percent of Americans expected war with Japan a week before the attack occurred. So the attack on Pearl Harbor was more a consequence of a long-standing struggle in Southeast Asia than a result of the European war. It might well have happened even if Hitler had never invented the blitzkrieg and invaded Poland in 1939. The attack on Pearl Harbor certainly influenced the course of events in Europe during World War II, but it was not caused directly by them.
History is full of events like this, events that seem familiar, that elicit a sense of mild to deep understanding, but whose true historical context is different than we imagine. The complex details get lost in the mist of time while myths emerge that simplify and make stories digestible, in part to service one interest group or another.
Of course, if you have carefully studied the attack on Pearl Harbor, then we’re wrong; you do have a lot to say. But such cases are the exception. They have to be because nobody has time to study very many events. We wager that, except for a few areas that you’ve developed expertise in, your level of knowledge about the causal mechanisms that control not only devices, but the mechanisms that determine how events begin, how they unfold, and how one event leads to another is relatively shallow. But before you stopped to consider what you actually know, you may not have appreciated how shallow it is.
Similar arguments can be made about economics, sociology, abstract painting, music composition, etc. There are no one-sentence answers to naive questioners in these fields any more than in physics. We could argue about which fields are deepest, or which require longer periods of specialized education; but that is not the point. What matters is that in virtually all human endeavors, including even the crafts and the arts, meaningful inside knowledge can't be gained by a quick Google, a clueless question, or any other "instant" means; education and experience and effort are required.