The World Health Organization, the United Nations health agency, uses a system of six phases to warn of possible influenza pandemics.

VOA: special.2009.05.06

The current economic downturn grew out of a culture of irresponsible lending and borrowing and "a failure of the entire system,"

VOA: special.2009.06.19

Before last week's announcement, the total number of so-called exoplanets outside our solar system was just over five hundred.

VOA: special.2011.02.09

But with threats, a language barrier and fear of the legal system, victims are often unwilling or unable to seek help.

VOA: special.2010.06.14

Mizz Blackburn and Mister Szostak discovered the special system of genetic information in the telomeres that protects the chromosomes from ruin.

VOA: special.2009.10.07

He says that would reduce the need for an American missile-defense system proposed for the Czech Republic and Poland.

VOA: special.2009.03.07

In two thousand six, Defense Secretary Robert Gates advised President George W.Bush to base a missile defense system in Europe.

VOA: special.2009.09.19

However,the national social security law established a system that would grow and become a central part of American life.

VOA: special.2011.04.07

The head of the Lemuelson-MIT Award program says Doctor Selanikio's work has saved lives and strengthened the global public health system.

VOA: special.2010.05.03

Missus Lindbergh later admitted that both she and her husband failed to see the worst evils of the Nazi system.

VOA: special.2009.06.28

Doctor Pascal Meier of the University of Michigan Health System led an international study of one thousand five hundred patients.

VOA: special.2010.09.15

And,minutes after awarding the prize, Netflix announced a second one million dollar competition to improve the system even more.

VOA: special.2009.09.25

This week it named the winners of a million dollar competition to improve its system for suggesting movies to its members.

VOA: special.2009.09.25

An object in the solar system could be identified if it appeared to move from its place in the earlier photograph.

VOA: special.2010.07.11