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

VOA: special.2010.06.29

Mister Weindruch says his study is not complete and that his team will continue to observe the remaining monkeys throughout their lives.

VOA: special.2009.09.01

To learn how this is done, researchers first observe the normal flight paths of the insects.

VOA: special.2010.04.27

The Moon Mineralogy Mapper can only observe lunar soil to a depth of a few millimeters.

VOA: special.2009.09.30

In the sixteenth century, one astronomer suggested that navigators could observe the moon as it passed in front of different known stars to tell longitude.

VOA: special.2010.07.14

But the drug can be given only in centers where specially-trained doctors can observe patients.

VOA: special.2009.01.06

The news media and self-appointed ethics "watchdog" groups observe how lobbying is carried out.

VOA: special.2010.09.27

Will you be turning off your lights this Saturday night to observe Earth Hour?

VOA: special.2010.03.22

Scientists can observe what they believe to be dark matter only through its gravity.

VOA: special.2009.07.21

Conkling charged that President Garfield had failed to observe the policy of "Senatorial Courtesy."

VOA: special.2010.04.22

They did not observe births and deaths unless they were involved in medical work.

VOA: special.2010.01.17

On November eleventh, communities across the United States hold ceremonies to observe Veterans Day.

VOA: special.2010.11.05

Observe how healthily -- how calmly I can tell you the whole story.

VOA: special.2009.05.16

It was released in two thousand five to observe his ninetieth birthday.

VOA: special.2009.09.27