The Centers for Disease Control says HEPA filters are effective in clearing the air of many particles that cause disease.

VOA: special.2009.07.14

They helped cause angry whites to form the Ku Klux Klan and other groups that terrorized blacks for years to come.

VOA: special.2010.02.04

Their central nervous system may tell the brain that there is pain even when there is no cause for the pain.

VOA: special.2011.07.26

At the time that Miss Jordan left Congress, there were widespread reports that failing health was the cause for her decision.

VOA: special.2010.05.09

With this latest discovery, the researchers say noise pollution in coral environments raises yet another cause for concern for these organisms.

VOA: special.2010.08.10

But in cases with a known cause the experts say salmonella is responsible for more than one-third of hospitalizations.

VOA: special.2011.01.11

The World Health Organization says mosquitoes carry organisms that cause disease and death for millions of people throughout the world.

VOA: special.2009.05.26

The Centers for Disease Control and Prevention says heart disease is the leading cause of death in the United States.

VOA: special.2010.06.08

Researchers for the RAND Corporation and the University of California at Los Angeles have said that few medical errors cause injury.

VOA: special.2010.07.13

The system helped cause the South to be the poorest part of the United States for many years.

VOA: special.2010.02.04

In "The Crucible",for example, he shows what happens when unreasonable dislike and fear cause people to accuse innocent people of horrible crimes.

VOA: special.2009.11.29

For example, large numbers of visitors can mean large numbers of vehiclesthat cause pollution and road damage.

VOA: special.2009.09.28

And the announcement a month later of a non-aggression treaty between Germany and the Soviet Union gave Tokyo even more cause for concern.

VOA: special.2011.05.26

The Nano,made by Tata Motors, is expected to cause a transportation revolution for millions of Indian families.

VOA: special.2009.03.28