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

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

The number of mutations over time helped the team estimate when the duplications in soybeans took place.

VOA: special.2010.02.02

Over time, their credit limit is increased, but they do not pay off their debt.

VOA: special.2009.04.10

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

VOA: special.2010.01.19

Over time,high blood sugar can lead to blindness, kidney failure, heart disease and nerve damage.

VOA: special.2010.01.13

Its reddish color and changes in brightness over time make the planet an unforgettable sight.

VOA: special.2010.07.28

"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