1.   Although they sat up later than their normal bedtime, neither could find any explanation.

2.   I try to find an explanation for him.

3.   One can go to the thousands of human societies and find ingenious explanations for each incidence of masculinity and femininity.

4.   Scientists have been unable to find an explanation for this phenomenon.

5.   The first school of thought tended to examine data on outcomes in order to find an explanation.

6.   Some factors should be considered to find an explanation for the difference between that study and this one.

7.   No satisfactory explanation has been found for this spontaneous decline although changes in the nitrosamine content of foods may be one factor.

8.   She had found an explanation of events which satisfied her, an explanation which in a curious way brought her contentment.