In 1987, UNICEF released a special report, proclaiming ____ as the greatest medical breakthrough of the 20th century. It said “No other single medical breakthrough of the 20th century has had the potential to prevent so many deaths over such a short period of time and at so little cost.” It has been estimated that over 50 million lives have been saved in the past 40 years by the implementation of _____ . Fill in the blanks(all blanks same)
ORS (oral rehydration solution)