the second reason is teaching knowledge.Teaching means of training to teach the client to have knowledge. All the technical capabilities of all that when they, as man, they should share knowledge, give someone else because that knowledge will be beneficial to the public not to know, alone. When they know they should share. But if the obstacle in the teaching of the language. There are a lot of knowledge, it is not tolerance to other people. The knowledge is reduced because people all over the world can live no longer. It is unfortunately a lot. Suppose that Nuton can not speak English. Now, they would not have realized that the world is gravity. also They can teach knowledge to science aboard.