The antivenom that cures the bite of one kind of snake may not be effective for another kind of snake.

VOA: special.2009.05.05

The Race to the Top competition will look for states and local school systems with effective reforms in four areas.

VOA: special.2009.07.30

Life expectancy rates climbed, because doctors and scientists developed effective ways to prevent or treat diseases such as tuberculosis, typhoid,diphtheria,and influenza.

VOA: special.2010.12.02

One is a belief that a government is stable and that the justice and legal systems are fair and effective.

VOA: special.2009.12.19

The study in Benin found that solar-powered pumps are effective in supplying water, especially during the long dry season.

VOA: special.2010.01.11

The National Council on Teacher Quality is a research group that works to increase the number of effective teachers.

VOA: special.2011.08.11

So far it has proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.07

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

Some economists say this second round of what is known as quantitative easing, or "QE2," has not been effective.

VOA: special.2011.04.29

The rules were reformed after three studies showed that the hands-only method was just as effective as traditional CPR.

VOA: special.2009.06.09

Some economists think the plan needs to provide as much as one trillion dollars or more to be effective.

VOA: special.2009.01.09

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

In the United States, the Armed Forces Radiobiology Research Institute is looking for more-effective treatments for radiation exposure.

VOA: special.2011.03.30

Carol Pandak says tests found the new vaccine to be thirty percent more effective than the trivalent vaccine.

VOA: special.2010.01.18