One thing that really caught my attention was that User Research is entirely based on the scientific method to postulate its findings. As the author points out:
User researchers often misunderstand the nature of this process, and as a result fail to make unbiased and insightful observations, and to use these observations to develop a real set of hypotheses and predictions about user behavior. Insights come from observing users and developing models of their behaviors. The goal is to test our assumptions, beliefs and models – not to test the resulting designs or products we build.
This is absolutely elegant from a research standpoint - although if you are from any science research field this wouldn't cause any surprise to you - and really worth going further.
Read the entire article, stop and think for a couple of minutes on how this could be so beneficial for any product/service you're designing.