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

Clots can block the flow of blood to the heart or brain and cause a heart attack or stroke.

VOA: special.2009.10.20

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

The goal of the project is to examine in detail how tornadoes are formed and the kinds of damage they cause.

VOA: special.2010.05.11

Several years later, researchers discovered the exact cause of pellagra: a lack of the B vitamin known as niacin.

VOA: special.2009.01.27

The World Health Organization says alcohol abuse is the third leading cause of death and disability in the world.

VOA: special.2011.03.08

Jim Jennings from the Allstate Insurance Company says the number one cause of distracted-driving accidents is the mobile phone.

VOA: special.2010.07.01

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

We talked last week about a new report on preterm births the leading cause of death in newborn babies worldwide.

VOA: special.2009.10.26

Cardiovascular diseases of the heart and blood vessels are the number one cause of death around the world.

VOA: special.2009.04.08

The two researchers closely studied the records that listed errors involving medicines as the main cause of death.

VOA: special.2010.07.13

Plate tectonics is the area of science that explains why the surface of the Earth changes and how those changes cause earthquakes.

VOA: special.2010.01.12

A recent report in the journal Retrovirology found that xenotropic murine leukemia virus-related virus is not the cause of chronic fatigue syndrome.

VOA: special.2011.01.18

The Agriculture Department says poverty is the main cause of food insecurity and hunger in the United States.

VOA: special.2009.11.23