1. a fundamental bias that makes men do not think. All men have thought towards things are different.
2. defect of health defects of health, whether physical or mental, the effectiveness of such a reduction when the headache causes, what rarely think out. When it is cold it makes a headache thinking NT, or even coughing, sneezing, etc.
3. The environment is not appropriate. The chaotic environment. The subtle sound. Hot weather makes the lack of distracting thoughts. The idea is not loved.
4. Lack of language skills. We must use the language to convey thoughts and ideas. If the bad language, such as the use of ambiguous words, thoughts and ambiguous. It is located in a narrow band.
5. Not have knowledge and experience to think everything needs to be based on knowledge, knowledge is very important for those who are thinking more deeply, proficient. And if the experience of experience, it will help promote the idea is correct, useful knowledge and experience, it is important to make a very powerful idea.