They have a material that supplies electrons and a power source that lifts the energy level of those electrons.

VOA: special.2010.09.01

They drill down to the shale, then go sideways and inject high-pressure water, sand or other material into the rock.

VOA: special.2009.10.23

Tilling can remove weeds and the waste from last season's crops and help break down old plant material into fertilizer.

VOA: special.2010.09.28

One such material is asphalt, a substance often placed on top of buildings and used to cover road surfaces.

VOA: special.2010.03.02

The viruses appear to harm the bees' ability to use their genetic material to produce proteins needed to fight infections.

VOA: special.2009.09.15

At the time, she was searching for a way to make a material strong enough to use on automobile tires.

VOA: special.2010.02.09

The easiest way to get the rest of the oil out is to place heavy rocks on the crushed material.

VOA: special.2009.09.29

He said about one hundred kilograms of water had been found in the material ejected by the moon crash.

VOA: special.2009.12.30

He tested the cement, and says less could be used because the rice hull ash makes it a stronger building material.

VOA: special.2009.12.01

Obsidian is a kind of black glass formed when the heat of a volcano melts the silica material in sand.

VOA: special.2009.09.16

A farmer could save on wood or stone with a round design that needed less material than traditional barns.

VOA: special.2009.12.29

He and a team of researchers there have built a house made out of straw bale and hemp material.

VOA: special.2009.10.05

The book says the saying began because a competitor's face was cleaned with a cloth towel or other material.

VOA: special.2010.11.21

Knitting is a way of creating clothing by looping together long thin pieces of material such as cotton or wool.

VOA: special.2009.04.08