1.   Find a less controversial topic with which to experiment.

2.   I tried to avoid controversial topics such as politics and religion.

3.   In fact, their relations with the parties they serve sharply restrict their ability to tackle controversial topics.

4.   Textbooks on research methods rarely mention the problems that arise when undertaking research on controversial topics or conducting it in sensitive locations.

5.   Whatever route was chosen, water supplies would remain a controversial topic.

6.   Although this is the largest study so far of the controversial topic, it does not settle the matter.

7.   An interesting look at a controversial topic.

8.   And it has been nominated for a National Magazine Award for coverage of controversial topics such as human stem-cell research and Internet-governance policies.

9.   Another controversial topic has been gay rights.

10.   --Avoid controversial topics.