Entropy, an international and interdisciplinary journal of entropy and information studies, publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish as much as possible their theoretical and experimental details. There is no restriction on the length of the papers. If there are computation and the experiment, the details must be provided so that the results can be reproduced. There are in addition three unique features: Manuscripts regarding research proposals and research ideas will be particularly welcome; Comments on any related papers published in this journal and other journals can be published as short letters; Electronic files regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, will be deposited as supplementary material.