Which United Nations agency is known by the initials WHO?

Which unit of distance equals 220 yards, or one-eighth of a mile? Which unit of energy does the abbreviation kWh stand for? What is a local unit of Girl Scouts called? In measuring pressure, what does "psi" stand for? Which English city's "United" soccer club plays its home games at Old Trafford? A U.S. Army officer with one star holds which rank? U.S. courts ruled in the late 1990s that statistical sampling could not be used to apportion House seats in which 2000… Which state has the U.S. postal abbreviation MO?