writer Dava Sobel tells the story about longitude and how the problem of knowing it was solved.

VOA: special.2010.07.14

Wood and coal for fuel. Technology solved many of the problems.

VOA: special.2010.04.15

Stanford's team solved five problems and finished in fourteenth place.

VOA: special.2010.03.11

He said it is a serious international problem that should be addressed broadly and can not be solved entirely by military means.

VOA: standard.2009.04.13

Delegates here say climate change is a global problem and can only be solved globally.

VOA: standard.2009.08.31

"They are willing to accept a lot of militias and this is not being solved,"

VOA: standard.2009.10.31

The French prime minister said the crisis was created by an excess of public debt and that it will not be solved by creating even more.

VOA: standard.2009.03.24