bell system

Farming fields, a tractor or harvester with farm workers behind it…

A prayer tower in an Arabic city. Inside the mosque, people sit on the…

A Bolivian man pushes behind a plow being pulled by two large cows in…

A teacher in Africa has his young students clap and sing at their desks…

A woman recording instructions about pronunciation lessons for a…

Tracking shot of a forest. Moss hangs from tree branches. A squirrel,…

Machu Picchu, the ruins of an Incan city in the Andes Mountains of Peru…

The Acropolis of Athens in Greece. Stone pillars in Greek ruins. Great…

Stone ruins in Guatemala. A Mayan temple is seen, and an archeologist…

Four men one woman in law office going through books. Women in public…

Compass makes circle on paper. Man sits at drafting board in large…

Female telephone operators at desks, wearing headsets. People pay bills…