The 4th International Conference on Selenium in the Environment and Human Health will be held on 18-21 October 2015 in Sao Paulo, Brazil. This conference provides an effective scientific communication platform for researchers in different disciplines worldwide to elucidate and better understand those complex roles of Se as both essential nutrient and environmental contaminant. This proceeding includes 98 peer-reviewed extended abstracts prepared by Se researchers from 28 countries. These most recent Se research studies address inter-relationships between the geological and atmospheric...