The new study shows that happiness spreads through social networks like an emotional virus - a virus people would be happy to catch.

VOA: special.2009.01.21

The study also noted that when tilled soil particles come in contact with air, soil organic matter is lost through the process of oxidation.

VOA: special.2010.09.28

The study followed almost eight hundred fifty people from birth through age twenty-six.

VOA: special.2009.06.24

A year later,Darwin would complete his detailed study of evolution through natural selection.

VOA: special.2009.12.01

The study is to continue through June thirteenth.

VOA: special.2009.06.09