Darwin had been working on his theory for over twenty years when he published " On the Origin of Species."

VOA: special.2009.12.01

The building's Web site says that as many as twelve thousand people were working on the building at the same time.

VOA: special.2010.03.31

I did not want them to be difficult or to get in my hair while I was working on the computer.

VOA: special.2009.05.03

This time,it happened while he was working on a railroad with men who did rough work and looked rough.

VOA: special.2010.08.01

Yet businesses are working on machines that can produce tissue and organs a lot like a photocopier copies documents.

VOA: special.2010.10.19

She says donors are pumping in a lot of resources and civil society groups are working on access to education.

VOA: special.2010.05.20

Reports from Hollywood, California say that several actors, writers and producers are working on a movie version of "Atlas Shrugged."

VOA: special.2010.06.06

The American Bar Association's Committee on Judicial Independence is working on guidelines for when judges should recuse themselves.

VOA: special.2009.06.12

Scientists are also working on other plants that either use less water or use it better, or both.

VOA: special.2009.01.20

While the exhibit is going on, Tucker will be working on his latest work, the White House where the American president lives.

VOA: special.2010.07.30

They plan to continue working on it until the end of October when it will be taken apart.

VOA: special.2010.08.13

Now,researchers with the Rehabilitation Institute of Chicago are working on another method called TMR, or targeted muscle reinnervation.

VOA: special.2009.03.10

The Basel Committee on Banking Supervision has been working on a set of recommendations known as Basel Three.

VOA: special.2010.09.17

While scientists were studying the stars and moon to solve the longitude problem, a man named John Harrison was working on another project.

VOA: special.2010.07.14