Experts say the ability to take up lead is reduced when the pH level is above six and a half.

VOA: special.2009.06.09

LCROSS will then study the soil thrown up to ten kilometers above the lunar surface before it too crashes into the moon.

VOA: special.2009.09.30

Many of the islands that make up the Maldives rise little more than one meter above sea level, and could disappear under the sea if global temperatures continue to rise.

VOA: standard.2009.11.09

It shows a man at a typewriter and above his head, taking up more than half of the canvas and appearing in a purple cloud, is frontiersman Daniel Boone, wearing his coonskin cap and carrying his long rifle.

VOA: standard.2010.08.09