Today,we travel through city streets all over the world to explore street art, a popular and lively art movement.

VOA: special.2009.04.08

The revolution is based on the work of scientists who study the movement of the continents a process called plate tectonics.

VOA: special.2010.01.12

The Impressionists used bright colors, rough brush strokes and thick paint to show light and movement in its many forms.

VOA: special.2009.07.12

Experts credit the Greek astronomer Archimedes with developing the earliest known device to show the daily movement of the planets.

VOA: special.2010.09.29

Central Park was a huge success and helped create a movement across the United States for creating public gardens.

VOA: special.2009.10.30

The movement of businesses and people away from city centers led to the economic weakening of many downtown areas.

VOA: special.2010.01.11

Small changes in the movement of Neptune led several astronomers to believe that an undiscovered planet was affecting Neptune's orbit.

VOA: special.2010.07.11

These mechanical devices that show the relative placement and movement of the planets and moons are sometimes called orreries.

VOA: special.2010.09.29

The navigator also had to add any movement of the ship to the side caused by waves or the wind.

VOA: special.2009.12.23

She said she was an early member of an independent art movement and was against juries, medals and awards.

VOA: special.2009.07.12

The anger of the many educated but unemployed young people has been a driving force in the Arab Spring movement.

VOA: special.2011.05.27

Government rescues of banks considered "too big to fail" angered the public and helped fuel a conservative movement.

VOA: special.2010.04.16

In some cases,instead of a cast, a splint made of plastic or metal will be secured over the area to restrict movement.

VOA: special.2009.02.04

The Cyprus-based Free Gaza Movement and a Turkish aid group known by the letters IHH organized the flotilla.

VOA: special.2010.06.05