But she wrote that women's roles decreased over time as the Cherokee people accepted the values of the larger American culture.

VOA: special.2010.04.09

She shows how Darwin came to understand that these island animals had differences, developed over time, that helped them survive.

VOA: special.2009.02.27

Yet he thought that slavery would die out naturally over time -- and that outsiders should not force southerners to end slavery.

VOA: special.2009.02.09

Rosalyn Schanzer brings to life the clues that suggested to Darwin that living things evolve, or change,over time.

VOA: special.2009.02.27

Studies have shown that over time, most humans need eight to eight and a half hours of sleep for the best health.

VOA: special.2009.08.26

Volcanic activity broke the large island into pieces that came to the surface of the sea over time.

VOA: special.2009.12.16

Darwin's observations showed him that environments can change a little very quickly and a great deal over time.

VOA: special.2009.02.27

Calhoun said that for a long time he had believed that the dispute over slavery -- if not settled -- would end in disunion.

VOA: special.2009.03.26

"If you look back in history you will find that many presidents who were enormously popular in that first year became failed presidents over time.

VOA: special.2010.01.23

He thought that this was evidence that the bottom of the ocean had been lifted up by powerful geological forces over long periods of time.

VOA: special.2009.02.25

Experts say that while rotational grazing can save money over time, it also requires planning.

VOA: special.2010.01.19

Over time,MIC became a Mickey Mouse, something that lacks meaning.

VOA: special.2009.03.29

By that time,however, the American Civil War really was over.

VOA: special.2010.01.14

It doesn't mean it's going to be easy. But,I think it can be over the period of time that we're talking about."

VOA: standard.2010.07.22