The lowest performing schools would face changes such as replacing teachers and the principal or being closed.

VOA: special.2010.03.18

Some scientists now believe that tension headaches may result from changes among brain chemicals such as serotonin.

VOA: special.2010.03.30

Pop culture expert Robert Thompson says the changes could be seen in film and television as well.

VOA: special.2009.05.04

The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

He used the higher notes of a chord as a melody line and made other changes.

VOA: special.2009.05.03

He says the antenna can identify odors, as well movement,sounds and changes in barometric pressure.

VOA: special.2010.04.27

The changes were not made. And Tyler did as he said he would do.

VOA: special.2009.01.29

Over time,genes develop changes, known as mutations.

VOA: special.2010.02.02

"When they become infected with the al-Qaida bug, their idea of who they should target as an enemy changes."

VOA: standard.2010.05.18

Still there are good reasons to make positive changes in how we live and what we eat as we age.

VOA: standard.2010.06.17

But in the end, protests and peaceful revolutions, such as in Poland,and changes in Moscow brought it down.

VOA: standard.2009.11.09

Now he would just like to walk again. TBI can lead to physical disabilities as well as changes in mental ability, personality and behavior.

VOA: standard.2010.05.25

Several Democrats have said their town hall meetings were not as raucous, and they insist reform supporters remain adamant that Congress should approve changes to the U.S.health care system.

VOA: standard.2009.09.04

Leaving things as they are in the Arab world, the Institute for Peace study says, will result in cosmetic changes only, allowing autocratic rulers to fend off real democratic change.

VOA: standard.2010.05.19