Scientists study the world in which we live. They do this by curiosity and they can become

excited upon making novel discoveries and by finding means to explain yet unsolved questions. But scientists are normally not selfish; they like to share their excitement with other people. They publish their findings so that these become widely accessible to all those interested. In fact, they communicate their results also in their own interest. Scientists are eager to talk with other scientists working on the same and similar problems. By exchanging results and ideas, they have a better chance of success and they can reach their goal more rapidly. Most often the objectives of their study, being it in the fields of physics, chemistry or biology, share the same properties anywhere in the world. The laws of nature are the same in Europe and in China. For this simple reason the dialogue between scientists does not stop at political borders. Wherever in the world a scientist finds a colleague exploring the same problem, an exchange of their knowledge can help them to advance their studies. For these reasons international collaboration between scientists is flourishing.