Professor Roark says knowing the age of the corals might help scientists understand earlier water conditions and ocean surface productivity.

VOA: special.2009.05.12

She is the first woman to serve as solicitor general of the United States and earlier, as head of Harvard Law School.

VOA: special.2010.05.15

And earlier this year the same company that owns the Food Network launched the Cooking Channel.

VOA: special.2010.12.27

Mr.Obama smiled and joked throughout the forum,and earlier, as he toured the community college's wind turbine lab.

VOA: standard.2010.01.22

The president has used appearances in St.Louis,and earlier this week in Philadelphia, to appeal for public support in advance of a hoped for vote in the House of Representatives, a crucial step in the final stage of his push for a health care bill.

VOA: standard.2010.03.10

Every two weeks, a new writer and illustrator will build onto the story that earlier writers and illustrators have created.

VOA: special.2009.10.12

Two groups the Trust for America's Health and the Robert Wood Johnson Foundation released the report earlier this month.

VOA: special.2009.07.21

For now,however, the method offers the promise of making a map of asbestos easier and faster than earlier ways.

VOA: special.2009.11.17

Russian scientists Alexei Androsov and Naum Voltzinger studied wind action in an earlier examination of the Red Sea crossing.

VOA: special.2010.10.19

The artist who created Charlie Brown and his dog Snoopy had retired a month earlier because of poor health.

VOA: special.2009.10.25

Researchers from the University of Kansas in the United States and Chinas Northeastern University reported their findings earlier this year.

VOA: special.2010.03.16

He captured images of the spot and studied a picture that he had taken earlier of the same area on Jupiter.

VOA: special.2009.08.25

Earlier findings showed that happiness, obesity and the ability to stop smoking can also spread like infections within social groups.

VOA: special.2010.01.06

This is a big change from earlier models where NASA led and controlled the development of space vehicles.

VOA: special.2010.04.28