WRITINGS I: Digital Image Compression / nD Printing / Internet of Things / Unemployment Solution / Environment Pollution / Astronomy Concepts Syntheses, analyses, writings with original elements compose the book WRITINGS I covering theory and practice topics from science and engineering and placing them in the history of related events with helpful additions to grasp comprehensively the ideas. Based on a large number of sources of information, the book introduces in matters that are of great interest today: digital image compression, nD printing, Internet of things, unemployment solving, environment pollution and astronomy concepts. Nowadays the mankind social and economic development is based more than ever on scientific research and on translating in practice old and new ideas for wide public benefit. Penetrating at different depths in material or exploring its extensions, the book leads in the unusual worlds of physics, mathematics, astronomy, engineering and their research of challenging problems and unawares convinces the reader that those worlds are interesting and worth of study. With its presentation of themes in an easy to understand manner the book is a valuable source of knowledge for anybody interested. Irina Rabeja - MEE DCSc WorldWho'sWho