Usually may be because they are too confident, all I have encountered in some difficult times, I would not know what to do, just a few days ago, when I work, encountered some problems, I feel can be solved, but later found that this knowledge I had it is never touched, then a colleague came to help me, he looked at it, he said this is the RFID applications knowledge, need to have the expertise that can solve the problem, then he try to deal with it, he will help me with the problem resolved, that is from that time, I think the future no matter what kind of knowledge, I should understand some, otherwise, will make their own very awkward.