How Materials are broken Every material has their own defect. Suppose that there is somthing long steel wire, like clothes hanger. If you want to cut it, maybe you are going to band it upside and downside. While you band it, what happens in the material with nano size? In the banding point(the tip) many defects are generated. We call this defects "dislocations". The dislocation is generated near the tip, especially the most in the tip. And this dislocations move to the tip. If you band over and over, you feel that banding is more hard than just conducting. Because each dislocation makes other dislocations moving hard. So to move this dislocations, It needs more force. And same time, dislocations that be more hard to move are piled up in the tip. At the end of state, piled up dislocations make material too hard to band, your force cut atoms bond and the material will break. We call it fracture.

I want to know your opinions in this case. In Korea, In fact it is very bad habit, many people(especially youngs) usually evaluate the others by appearance. So if a man meet the other at first, he might say "You are so pretty(handsome)", "You have a nice body". I think this compliments are make someone's feel good. But some time ago I heard that In some country(auctually I don't know what country), they don't like hear that compliments because they think evaluating someone by appearance is very rude. It is common in my country, but I think it might be case. so I want to know your opinions. How do you think? Is it rude? please give me your opinions.

I'don't know what I want to be I want to do many thing like a traveling, studing many subjects, etc but I don't know executally what I want to be. I wonder how many people have their apperent dream. I have no dream, so I have no motivations. I feel that I just waste my time. what can I do for solve my problem? please tell me advise

I want to go malta to study I'll go to aborad to study English. so I concern about many contries but I don't have much money. So I've chosen some contries.. then I found Malta. I want to know about malta. So if you know about malta, please tell me some imformations.

I want to go to Canada, but I don't know what I prepare.. After June, I'll go to Canada for language study. It's the first time that I go to abroad. Except any papers, what should I prepare? Are there something special manners that different from other country?(especially Korea) Is it be, should I learn it? And It all depend on how I do but Is there have racial discrimination? I haven't prepared anything so I worry all about them. Please give me some hint.

In weekend, what shall i do? In korea, these four days was holidays (new year day) but I'm in domitory, so I didn't know what shall i do. i played game, and did anything else. but it made me more felt down If you have a four days holidays, what will you do? Tell me your hobby that i can apply myself