NASA scientists hope to extend their search for water as deep as five meters beneath the surface of the moon.

VOA: special.2009.09.30

"The red wigglers are the best varieties for doing it because they are more of a surface feeder.

VOA: special.2011.07.05

The researchers say the report offers evidence that one or more comets were responsible for a sudden cooling period on Earth's surface.

VOA: special.2009.01.20

It carried oxygen,water, electricity and food for two men for two days on the moon's surface.

VOA: special.2009.07.22

The result is a container with a hard surface that will last for many years.

VOA: special.2009.09.14

Even civil rights leader Reverend Jesse Jackson admits that on the surface, Gary,Indiana seems an unlikely location for a tribute to one of the world's most popular musicians.

VOA: standard.2009.07.11

"We know that surface use of dispersants decreases the environmental risk to shorelines and organisms at the surface and we know that dispersants break down over weeks rather than remaining for several years as untreated oil might."

VOA: standard.2010.05.18