1.   Researchers have partly solved the mystery of what causes a suntan, and it is not a pretty picture.

2.   To the relief of mycologists, the researchers have solved a century-old mystery.

3.   Yanagimachi hinted that the researchers had solved the problem of making male mouse clones, but would not confirm it because the work has not yet been published.

4.   Researchers have solved an old medical mystery by demonstrating why dangerously high doses of aspirin can lower blood sugar and make cells more sensitive to insulin.

5.   Researchers are solving that problem by testing filters and employing mathematical formulas that will pinpoint the evidence police need, Sandia scientist Colin Smithpeter said.

6.   After decades of brow-beating to find out how aspirin provides the body with blissful relief, researchers have finally solved the mystery.

7.   After decades of head-scratching to find out how aspirin provides the body with blissful relief, researchers have finally solved the mystery.