Tacit knowledge is that implicit knowledge you have that is difficult to express or explain. [[Luke Burgis]] refers to this as [[Tacit knowledge|Inarticulate knowledge]]: the knowledge that one is unable to articulate to someone else. Examples of tacit knowledge are how to operate a manual transmission smoothly, why you trust someone, how to play an instrument, or the thousands of tiny bits of knowledge that go into doing your job well. The importance of inarticulate knowledge does seem to contradict many of the teachings of [[Richard Feynman]], who says that if you can't reduce something to the freshman level, then it means you don't really understand it. [[Albert Einstein]] said, "If you can't explain it simply, you don't understand it well enough." Yet [[Luke Burgis]] says, "I think this kind of tacit knowledge and inarticulate knowledge is undervalued in our society. … because we always want to be able to explain the science and give the hard reason for it. But a lot of life doesn't work like that."