1.   As scientists track more blood-borne illnesses and hospitals struggle with dwindling blood supplies, the technique is gaining favor with both patients and health care providers.

2.   But the seasonal ground movements have to be taken into account when scientists track other kinds of subtle ground movement that can signal quakes.

3.   By analyzing these, scientists can track the onset and retreat of ice ages.

4.   In one set of experiments, scientists tracked the increase in violent fighting that occurs in laboratory animals after they are given alcohol to drink.

5.   Scientists are now tracking the seeds from the distributor to individual farmers.

6.   Scientists track underground nuclear blasts and earthquakes in the same way, measuring the seismic waves they send out through the earth, often over extremely long distances.

7.   Scientists have tracked similar, though less dramatic, changes in aquatic plant life in response to modern fluctuations in rainfall, Woodhouse said.

8.   Scientists have tracked the amount of arsenic in well water in the region for more than four decades.

9.   Scientists were anxiously tracking its movements.

10.   That way, scientists can track them.