They found that a city with only white rooftops could reduce the urban heat effect by thirty-three percent.

VOA: special.2010.03.02

A new study has found the strongest evidence yet that smoke-free laws can reduce a major effect of tobacco smoking - heart disease.

VOA: special.2009.01.07

New Wal-Mart stores have had a big effect on small communities in the United States.

VOA: special.2009.07.17

Online music stores and file-sharing have had a big effect on record sales.

VOA: special.2009.04.03

So each eye sees a slightly different image, producing the 3-D effect.

VOA: special.2010.01.26

The effect of a disease - or a condition like obesity - can be tallied by a measure called quality-adjusted life years lost.

VOA: standard.2010.08.10

(Test) The U.N.Secretary-General says he is "optimistic" a climate-change agreement can be reached in Copenhagen that will include specific recommendations on key elements that will take effect immediately.

VOA: standard.2009.12.09

Tuberculosis is a common side-effect of HIV infection.

VOA: standard.2010.07.21

What remains to be seen is whether this will have a long-term effect,positive effect on the security forces, and maybe are there ways we can replicate some of these treatment programs to be more inclusive of the general public."

VOA: standard.2010.06.23