To test the theory, he asked more than sixty college students to take part in an experiment.

VOA: special.2009.08.18

Doctors who suspect a patient has Alzheimer's must test the person for many other physical problems first.

VOA: special.2009.09.15

Thirty-six volunteers in South Africa will test the safety of an African-developed vaccine against H.I.V.

VOA: special.2009.07.29

The Supreme Court has heard many cases that test the meaning of the First Amendment.

VOA: special.2009.05.22

One team went to Cuba to test the idea that mosquitoes spread yellow fever.

VOA: special.2010.05.18

HeLa cells have gone to the moon to test the effect of zero gravity.

VOA: special.2010.07.21

For the first time, scientists around the world had a limitless number of cells they could use to test the effects of diseases, medicines and chemicals.

VOA: special.2010.07.21

Now,one of them moved closer, slowly,as if to test the old mans strength.

VOA: special.2010.02.27

Jonas Salk used these HeLa cells to test the first vaccine for polio.

VOA: special.2010.07.21

Gemini would test the men's ability to live and work in space.

VOA: special.2009.06.24

Supporters of President Cleveland wanted to test the silverites' strength.

VOA: special.2010.07.01

The next step was to test the lunar landing craft.

VOA: special.2009.07.08

They wanted to test the landing module near the moon.

VOA: special.2009.07.08

And test the soil before adding lime and fertilizer.

VOA: special.2010.03.02