But the study says it can be more economical in the long term than using fuels like gasoline, diesel or kerosene.

VOA: special.2010.01.11

Doctor DeMeo says some of the people in the study did not smoke much but still developed severe lung disease.

VOA: special.2009.06.03

But in a recent study they declared that forty percent of the tweets captured over a two-week period were "pointless babble."

VOA: special.2009.09.14

But why is that? A study published in two thousand three in the journal Science offered an answer.

VOA: special.2009.06.24

The exact cause is unknown. But in a recent study, an experimental drug showed signs of halting the disorder in laboratory mice.

VOA: special.2010.05.19

But one of the authors of the study, Tim McClanahan from the Wildlife Conservation Society, says fisheries in Africa face another threat.

VOA: special.2009.08.11

The study found that one in five children over age two had a low risk of serious injury but received CT scans anyway.

VOA: special.2009.10.28

But a new study from the University of Aberdeen in Scotland found no need to delay.

VOA: special.2010.08.11

Honorary authors, also called guest authors, receive credit in a published study but had little to do with designing it or writing the article.

VOA: special.2009.10.08

But a new study suggests that many farmers recognize the value in keeping trees.

VOA: special.2009.09.01

But it will mainly study the universe in infrared light.

VOA: special.2011.05.23

But in a new study, researchers used a vaccine aimed at a different part of the virus.

VOA: standard.2010.07.21

But they also asked the people in the study where they were exposed to tobacco smoke.

VOA: standard.2010.06.15

But that's not what happened. "In our study the majority of patients identified with newly diagnosed HIV infection were found late in their disease course."

VOA: standard.2010.07.23

They acknowledge they will not be able to prevent similar practices in the future, but they are hopeful their study will promote changes for the better.

VOA: standard.2009.03.21

But in a study involving the HeartMate II pump, survived that long.

VOA: standard.2010.01.27

But in the 13th century, the capital city,Angkor,died off, and a new scientific study indicates that climate, specifically decades of drought interspersed with intense monsoons, helped bring down the Khmer capital.

VOA: standard.2010.04.05

"And that was in direct contrast with the c-section babies, who harbored bacterial communities that resembled human skin, but not their own mother's human skin any more than any of the other mothers in the study."

VOA: standard.2010.06.30