Reduce waste by bringing food and drinks for the trip in re-usable containers.

VOA: special.2009.06.19

This makes it less usable in poor communities.

VOA: special.2010.06.30

"This is the world's first commercially available pedal generator, allowing to convert your human power into usable electricity.

VOA: standard.2010.02.24

Buffalo Soldiers were responsible for cutting the first usable wagon road through Yosemite's Giant Forest of Sequoia trees.

VOA: standard.2009.11.25

The number-two military man at the Pentagon, General James Cartwright, said it would probably take several more years for Iran to take that highly enriched uranium and develop a usable weapon.

VOA: standard.2010.04.14