To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.
Problems are the vitality of any science.
However, we especially encourage interdisciplinary submissions. Every submission should include the following parts. The background and motivation of the research direction, open issue, or challenge problem. Explanations about the significance of the research direction, open issue, or challenge problem. All submissions must be written in English and should be no more than 2500 words length.