Over the next twenty years, Borlaug worked with Mexican scientists to develop crops that were able to resist disease.

VOA: special.2009.11.10

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

VOA: special.2009.02.25

People infected with this form may develop the disease over many years without any major symptoms.

VOA: special.2010.01.04

In women over eighty, those who smoked were five and a half times more likely to develop AMD than the women who did not smoke.

VOA: special.2010.03.09

Over the centuries,scientific thinkers worked to develop these devices and improve their accuracy and complexity.

VOA: special.2010.09.29

It also can develop slowly, over a period of days.

VOA: special.2010.07.27

Over the years,he worked to develop the profession.

VOA: special.2009.11.24

Over time,genes develop changes, known as mutations.

VOA: special.2010.02.02

Over time,cancer could develop.

VOA: special.2010.07.06

The Bill and Melinda Gates Foundation Friday pledged $10 billion dollars over the next 10 years to research and develop new vaccines.

VOA: standard.2010.01.29

Lynn was referring to decades of controversy over whether it was possible to develop a missile that could hit and destroy an incoming missile in flight, and to do so at a reasonable and sustainable cost.

VOA: standard.2010.03.26