Marc Rayman says Vesta appears to have a layered structure, one that is similar to planets like Earth, Mars and Venus.

VOA: special.2011.07.27

This way,they can observe changes in the structure of a deadly organism from one generation to the next.

VOA: special.2010.06.29

The round stone structure honors people from the District of Columbia who died in World War One.

VOA: special.2009.05.25

One hundred sixty-seven men were killed when the structure exploded after a gas leak.

VOA: special.2009.03.22

For reproduction, orchid flowers have male and female parts joined into one structure.

VOA: special.2010.04.06

Edward Carlson designed the one hundred eighty-four meter tall structure.

VOA: special.2009.03.04

"The power structure in Kandahar in the eyes of the people of Kandahar is the problem number one, and the Taliban and al-Qaida number two."

VOA: standard.2010.05.28