He realized that this "teach-in" method would be a useful way for the public to express concern about the environment to federal and state officials.

VOA: special.2010.04.21

Oil became a useful product only in the middle of the eighteen hundreds.

VOA: special.2010.02.25

Some consider it an election ploy. But other surveys show the majority of French believe it is a useful conversation.

VOA: standard.2009.12.30

Hunt's computer program gives them a useful new tool for addressing the problem.

VOA: standard.2010.08.04

"It is a useful instrument for the villagers.

VOA: standard.2010.05.25

And they list a cause of death. Useful information might also be found in local court and tax records.

VOA: special.2010.06.28

My bikes wouldn't fetch a nice price and wouldn't be worth trying to sell, but they could be useful to somebody else."

VOA: special.2009.11.16

The systems are especially useful for those who are too sick to go a long way for water.

VOA: special.2009.07.27

Babe was very useful. For example, Paul had trouble removing trees along a road that was not straight.

VOA: special.2009.01.24

These pants were especially useful for miners in California who needed clothing made from a strong material.

VOA: special.2009.12.18

He says that by making them into a sculpture, he has made useless objects useful again.

VOA: special.2009.11.13

Professor Prum says the colorful feathers were probably useful in getting the attention of a mate.

VOA: special.2010.03.16

She decided she would be more useful as a nurse than as a student.

VOA: special.2010.05.26

Chicken feathers are useful, and not just to a chicken.

VOA: special.2010.06.01