We often judge things as being more valuable if we have to invest a considerable amount of effort instead of acquiring things effortlessly. Sometimes we can only see the value of things when we lose them. Many studies show that fast scrolling does have a disruptive effect on our understanding. On the other hand, a disruption of our understanding itself is sometimes extremely instructive. For example, the study by Singer and Alexander showed that for very slow readers the learning from the screen was better than learning from paper. An reversed U-shape of optimal learning appears: too little effort results in superficial processing, too much trouble gives poor or no processing at all. An optimum is in the middle, at the top.