Doctor Ruhli says researchers used this method to study changes in the tuberculosis bacteria from two thousand year-old mummified tissue.

VOA: special.2010.06.29

Geographers from three American colleges did a study that will appear in the Proceedings of the National Academy of Sciences.

VOA: special.2010.03.23

During the study period most countries had greater temperature changes from year to year than they have had historically.

VOA: special.2011.05.17

Ellen Yeh from the Stanford University School of Medicine in California was one of the authors of the study.

VOA: special.2009.08.03

The study found that hopeful individuals were fourteen percent less likely than other women to have died from any cause.

VOA: special.2009.04.15

The findings came from a study of more than three hundred forty thousand adults living in the United States.

VOA: special.2010.08.03

Also,the study says the United States fell from thirty-fourth to forty-ninth in female mortality and from forty-first to forty-fifth for men.

VOA: special.2010.05.05

The new study involved researchers from the University of Chicago, Harvard University and the University of California at San Diego.

VOA: special.2009.12.22

I have over one hundred different kinds of birds from all over the United States in my study at home."

VOA: special.2010.04.03

The study concludes that the worldwide health effects from drinking are about the same as that of smoking nine years ago.

VOA: special.2009.09.08

The study found that the aspirin users had an almost thirty percent lower risk of dying from their cancer.

VOA: special.2009.09.01

The study found that about fourteen percent of those receiving the e-mail removed sexual behavior information from their site.

VOA: special.2009.02.03

The researchers did a study of adult beliefs about the possibility of health risks to children from third-hand smoke.

VOA: special.2009.01.07

Costs for graduate study in the United States also differ from school to school, and even from program to program.

VOA: special.2010.04.08