Dr. John Lane, chief of the U.S. Geologic Survey, Office of Groundwater, Branch of Geophysics, explains the procedures for taking electrical resistance measurements of the earth to Djiboutian students using an electrical earth resistivity meter. Lane is part of a team of American water resource experts working with Combined Joint Task Force-Horn of Africa to teach various Djiboutian government agencies an advanced course on geophysics in groundwater exploration. CJTF-HOA's capacity building projects contribute to U.S. government efforts to promote clean water, functioning schools and improved medical facilities for a better quality of life.