The ancient Aztec civilization in current day Mexico used obsidian for making hunting tools and jewelry.

VOA: special.2009.09.16

Throughout history, the language spoken by a powerful group spreads across a civilization.

VOA: special.2009.12.02

Long after the fall of the ancient Egyptian civilization, doctors and alchemists in Europe continued the custom of showing a sign of the gods' help and protection.

VOA: special.2009.03.22

Here is part of her performance: The black death demolishes civilization.

VOA: special.2009.04.17

"The moral effects around the planet, the increase in morale of the radical jihadists and the damage to western civilization will be incalculable.

VOA: standard.2010.07.30

"Angkor was really the dominant civilization in that part of the world without any question.

VOA: standard.2010.04.05

The Spaniards never found or they would have destroyed it," After the Incan civilization collapsed, the site was abandoned and the rainforest overgrew it for 400 years.

VOA: standard.2009.12.15

Or maybe,instead of a radio signal, an alien civilization sent us something physical.

VOA: standard.2010.04.16

Fifty years ago this week, a young Cornell University scientist named Frank Drake pointed a radio telescope at a distant star, hoping to hear transmissions from an alien civilization.

VOA: standard.2010.04.16

When the search began, a half-century ago, it seemed sensible to assume that as technological civilization increased on a planet, more and more signals would be broadcast into space.

VOA: standard.2010.04.16

"The planet on which our civilization evolved no longer exists."

VOA: standard.2010.04.21

On the the 40th anniversary of Earth Day, this warming planet we live on is posing serious new challenges to human civilization: increasingly severe droughts, floods,and storms across the globe, and slowly rising ocean levels.

VOA: standard.2010.04.21

"Language is very important to teach another younger generation of young men and women coming from elementary and high schools for job opportunities and understanding how small the world is and also the contributions the Arab world has given to civilization."

VOA: standard.2010.05.20