Professor Stone says the emotional patterns could be linked to changes in how people see the world, or maybe even changes in brain chemistry.

VOA: special.2010.08.03

The names of more than fifty-eight thousand Americans killed or declared missing-in-action are cut into the stone.

VOA: special.2009.05.25

The artist draws an image with oily ink onto a piece of stone or other flat surface.

VOA: special.2009.09.02

Soldiers with such weapons could be put into position behind stone or earth walls.

VOA: special.2009.12.03

It wasn't just the beauty of the polished stone block walls or the fact that this abandoned city sits atop a narrow ridge more than 2400 meters above sea level.

VOA: standard.2009.12.15