Study leader Pooja Tandon says even small calorie reductions on a regular basis can prevent weight gain over time.

VOA: special.2010.01.27

Doctors say that over time the damage interferes with the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: special.2010.06.23

They say this can provide important information about how ocean conditions change over time and how corals react to climate change.

VOA: special.2010.08.10

Didn't want to go to school." Bullying is defined as negative behavior repeated over time against the same person.

VOA: special.2010.04.22

He told her his ideas about how species evolve over time -- what he called the transmutation of species.

VOA: special.2009.02.25

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

It gets worse over time. The disease affects a small area of cells in the middle of the brain.

VOA: special.2009.04.07

He says looking back thousands of years can help researchers look forward by understanding how a disease changed over time.

VOA: special.2010.06.29

Readers can better understand how informed consent and the question of morality in medical experiments have changed over time.

VOA: special.2010.07.21

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