Horizon International invites you to share and submit articles on successful approaches for possible inclusion in the series "Realizing Sanitation and Hygiene for All." The first article, now published on the Solutions Site, at www.solutions-site.org/node/1255 focuses on the background of the problem and what it means for nearly half the people of the developing world who lack adequate sanitation and hygiene. This article is largely based on and contains many quotes from our book, Water and Sanitation Related Diseases and the Environment: Challenges, Interventions, and Preventive Measures, a Wiley-Blackwell collaboration with Horizon International.