The hydrogen atom is the main constituent of baryonic matter in our Universe and cosmic evolution largely relies on its ability to absorb/emit radiation and to form heavier elements and molecules. From the epoch of recombination to today's galaxies, hydrogen atoms had gone through several thermal phases as bound structures developed and stars began to shine. Our aim is to bring together scientists to discuss at various epochs and in various structures the dominance of the ionized, neutral and molecular hydrogen and the interplay between these phases and light. In view of Future Instrumentation, capable to enlight our knowledge of HI Survival Through Cosmic Times it is important to outline the current state of art.

The meeting will take place in one of the most beautiful spots of the Tuscan countryside, far from the noise and haste of everyday life. Located south of Siena, the Abbazia di Spineto and its rural environs is still one of the few unspoiled venues in Tuscany, ideal for a few days of retreat and discussion. The central Abbey is surrounded by several old houses and the whole complex provides lodging facilities for all the participants. Common areas in the rural houses and in the Abbey definetely favour the interaction among subgroups and at the same time offer a variety of stimulating enviroments.