Worldwide, 200 million children under the age of five are deprived of basic health care. In the United States, more than 40 million people lack health insurance. As the U.S. wrestles with its own health care system, Worldfocus explores success stories -- and cautionary tales -- of different health systems around the world.

Singapore has one of the best health care systems in the world, according to the World Health Organization, and the price tag is a mere 4 percent of the country's GDP (compared to 17 percent in the U.S.). In Canada, the government guarantees all citizens basic medical services, and there is little paperwork, but long lines have sent some Canadians to private clinics. In Brazil, rich and poor alike benefit from free health care -- but offering so much has put a strain on the health system and conditions are substandard.

Our partners around the world also explore health care in Britain, China, Argentina and beyond.

"Health of Nations" is a collection of signature videos, interviews, reporter observations and analysis from the field and blogger perspectives.