Primary school students need make it hobby to know "how it is made". By sharing "how it is made",primary school students know manufacturing sector well, without knowing "how it is made",it is ignorance to ask and consume that. Isn't it ? Litigancy is compulsion now in text-books. Social(control) is compulsory now in teaching. Be control while being aggressive. One should learn to mix control and aggression, Have contrast while having brightness to thing.