21.   The researchers examined gains and losses in test scores over the school year and summer break.

22.   The researchers examined heart test results from the end of that clinical trial and readings from a year later.

23.   The researchers examined store sizes, income levels and areas with high levels of households receiving public assistance.

24.   The researchers also examined precipitation records from the United States, China and the former Soviet Union.

25.   Today, many market researchers are examining social attitudes as well as consumer preferences to identify youth trends.

26.   When researchers examined the fish, their stomachs were filled entirely with the tails of other electric fish.

27.   When the researchers examined the andro they had used, they found trace amounts of the metabolite.

28.   When researchers examined cancers from women who did not have a strong family history of the disease, the gene seemed normal.

29.   When researchers examined costs, they found that even mediocre day care was more than many could afford and quality care was virtually unreachable for most.

30.   When researchers examined strokes based on the number of days per week the participants ate fruits and vegetables, they found a similar relationship.