What are top pure mathematicians experts in? How about top doctors? The easy answers would be "pure math" and "medicine", but these are a bit too vague to be satisfying (What is pure math? What is medicine?). They also don't capture all of what these experts excel at. To know what an expert of a particular type is truly expert at, we need to understand the system that creates that type of exper...

One of the most effective ways to get ourselves to regularly do a behavior is to make it automatic through habit formation. Once something has become a habit we no longer have to worry about forgetting to do it, or worry about lacking sufficient motivation. We do the behavior without even trying to do it, without even thinking about it. Habits make behavior effortless. We can program ourselves ...

It can sometimes be useful to think of yourself as consisting of multiple systems. You have an emotional system that constantly processes your sensory input and thoughts, and produces emotions like fear, anger, happiness and contempt based on this input. You also have a reasoning system, which is what you use when you are reasoning, planning, analyzing and consciously predicting. But the operation...

Suppose that Tom and Sally have a disagreement over a factual question (as opposed to one of values or preferences). She claims that the argument he is making has errors or is unconvincing, but Tom feels the same way about her argument. They debate the question for an hour, but afterwords are still each adamantly convinced that his or her own reasoning is sound while the other person's is flawed. ...

It is impossible to perceive anything directly. What we experience as a visual image starts out as electromagnetic radiation of various frequencies which reflects off of an object and then hits our eye. The photoreceptor cells in our eye are stimulated, information propagates down the optic nerve, and so forth. We usually interpret this as seeing the object we are looking at. However, a more compl...

According to evolutionary theory, emotions evolved because they were helpful for survival. Anxiety alerts us to potential danger and makes us wary. Anger motivates us to fight and shows our allies that we need help. Jealousy motivates us to keep our mates to ourselves to help maximize the number of our offspring that survive to child-bearing age. But the environment we live in today is obviously v...

When you ask people why they read non-fiction, they are likely to tell you that their primary motivation is to learn. But are people's behaviors really consistent with this being their motivation? Almost all of the information that we read is already forgotten days after having read it, and most of what remains is forgotten after months. Even those facts or ideas that are particularly interesting ...

Normally we divide up the elements of knowledge into the traditional categories of history, literature, math, physics, chemistry, psychology, fine arts, and so forth. We are so used to these divisions that it may not even occur to us that knowledge can be split in plenty of other ways. But imagine, for instance, a school that offered the following subjects: Making Observations Formulating Th...