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

Medical experts say small amounts of carbon monoxide over a long period of time can greatly harm an unborn baby.

VOA: special.2010.02.02

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

Drinking large amounts of alcohol over long periods of time has also been linked to a number of cancers.

VOA: special.2009.09.08

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

Charles Darwin developed the theory of how living things develop from simpler organisms over long periods of time.

VOA: special.2009.02.25