But he is hard at work. He and his team currently are trying to make algae that can change carbon dioxide back into fossil fuel.

VOA: special.2010.07.20

After four to ten days, they change again, into creatures called pupas.

VOA: special.2009.05.26

My words seemed to change Simon into a wild animal.

VOA: special.2009.07.18

(theme) (Obama Speaking) As the nation's 44th president, Barack Obama came into office eager to meet the public's demand for change.

VOA: standard.2009.12.29

"This was about regime change, and everything was put into place to accomplish that regime change,".

VOA: standard.2009.11.10

(Obama's Speech) In crafting the U.S.response to global climate change, the president said congressional lawmakers must take into account the real price of America's heavy reliance on petroleum-based energy.

VOA: standard.2010.06.14

The bloody assault on the beaches of Normandy would change the course of the war, allowing the Allies to liberate occupied France and advance into Germany, as Soviet troops advanced against the Germans from the East.

VOA: standard.2009.06.02