It was first developed in the Roman Empire about two thousand years ago.

VOA: special.2009.09.16

Researchers first developed an experimental vaccine against East Coast fever thirty years ago.

VOA: special.2009.11.03

When patent laws were first developed, most patents were for machines.

VOA: special.2010.07.16

The tests are the first step in human clinical trials of two vaccine candidates developed at the University of Cape Town.

VOA: special.2009.07.29

It advises girls to delay their first pregnancy until their bodies have fully developed.

VOA: special.2010.08.09

Those first days when Helen Keller developed the ability to talk were wonderful.

VOA: special.2009.11.08

In the early nineteen eighties, Professor Ejeta developed the first sorghum hybrid seeds.

VOA: special.2009.07.07

But scientists think the dinosaurs developed feathers first, and then wings.

VOA: special.2010.06.04

The defibrillator of today has developed from the first defibrillators.

VOA: special.2009.08.11

In that job, she developed the first liquid crystal polymer.

VOA: special.2010.02.09

Members of the first group developed pellagra.

VOA: special.2009.01.27

Swan did that and more. As he gained experience on his first expeditions, he developed a talent for raising money and hiring accomplished guides who could teach him.

VOA: standard.2009.12.10