Four years ago, the labor agency estimated that more than twelve million people were in some form of forced labor.

VOA: special.2009.06.08

Each side of these devices blocks a set of images that appear in a different form of polarized light.

VOA: special.2010.01.26

Once the clay dries, the glassmaker dips the form in a container of hot liquid glass until it is covered.

VOA: special.2009.09.16

Medical workers in Haiti are now trying to spread the message not to use river water without some form of purification.

VOA: special.2010.11.10

In this form, the signs of the disease appear and begin to grow worse, with no periods of disappearance.

VOA: special.2009.01.06

These comedies, with plenty of songs, were a popular form of entertainment in the nineteen twenties and nineteen thirties.

VOA: special.2009.02.15

Frank Ruhli says studies like this can prove useful in the fight against H1N1, another form of the influenza virus.

VOA: special.2010.06.29

You can usually find good clay in low areas of islands or land, especially if volcanoes helped form the land.

VOA: special.2009.09.14

The census form asks ten questions, including the number of people living in each house, their ethnic group and race.

VOA: special.2010.05.07

Vaudeville was the most popular form of show business in the United States in the early nineteen hundreds.

VOA: special.2009.10.11

European Union officials say they will form a team of experts to investigate non-Islamist threats in Scandinavian countries.

VOA: special.2011.07.30

They form when plants hold sand in the outer parts of the dune but the center of the dune continues to move.

VOA: special.2010.01.04

The bigger reserves could be in the form of cash or common stock, also known as common equity.

VOA: special.2010.09.17

Newton used his great skill in mathematics to form a better understanding of the world and the universe.

VOA: special.2011.06.01