1.   Another mystery that will require more research is why the structures are found miles west of what would be the normal heat source for such vents.

2.   Because it was granted speedy approval, the U.S. Food and Drug Administration required post-marketing research.

3.   Both require research and sometimes produce surprising results.

4.   But finding a particular song or melody and getting legal clearance to use it in a film can require laborious research on the part of a movie studio.

5.   But he acknowledged the hot dog link to diabetes requires further research.

6.   But some of the results are still frustratingly erratic, he added, and hard proof will require more research.

7.   But that requires more research and, for now, there is no way of picking out those who should and those who should not get defibrillators.

8.   But that still requires legal research.

9.   Companies are less eager to make health claims, which require elaborate research and clinical trials to prove.

10.   Determining dates and participants requires much research.