And that's probably the simplest of all of them." The students first listed the problems in order of difficulty.

VOA: special.2010.03.11

Varroa mites have been causing serious problems in bee colonies in the United States since the late nineteen eighties.

VOA: special.2009.09.22

She says there is no information to explain in detail why tobacco smoke causes behavioral problems in children with asthma.

VOA: special.2009.01.13

The researchers say governments have a responsibility to work with indigenous people to help them solve problems in their community.

VOA: special.2009.07.20

The experts said women who wish to become mothers should take folic acid to prevent problems in their babies.

VOA: special.2009.04.21

And,he says that is good news because the world needs creative thinkers to help solve increasingly complex problems in the future.

VOA: special.2009.04.24

And now Ms.Rhee appears in the film "Waiting for 'Superman,'" a documentary about problems in the educational system.

VOA: special.2010.10.21

But the researchers say there are many problems in the way the press has reported on their paper.

VOA: special.2010.02.03

They say their findings show that even low levels of smoke may cause behavior problems in children with asthma or others at risk.

VOA: special.2009.01.13

An American study has shown a link between tobacco smoke and behavioral problems in boys with asthma.

VOA: special.2009.01.13

The aim was to get people young and old across the United States to act locally in solving environmental problems in their areas.

VOA: special.2010.04.21

On Friday night, Prime Minister Naoto Kan spoke of the problems in a speech to the nation.

VOA: special.2011.03.19

And NASA is also being called on to develop new technologies to solve problems involved in long-term space flight for humans and robots.

VOA: special.2010.04.28

But he told students that problems in their own lives should not stop them from learning.

VOA: special.2009.09.10