11.   And with it comes a host of thorny questions.

12.   Another problem facing Feinberg is the thorny question of offsets.

13.   A merger between Bell Atlantic and GTE would pose thorny questions for the federal regulators who would review such a deal.

14.   A new rogue computer program, possibly intended to perform a public service, has raised thorny legal questions and seems sure to fuel the debate over computer privacy.

15.   A thorny question, to be sure.

16.   Both candidates deftly navigated a couple of politically thorny questions.

17.   But now, as scientists are eyeing human embryo cells as material for research, the experiment is giving rise to a thorny philosophical question.

18.   But the thorny questions about the appropriate use of ratings devices and blocking software are likely to be left unresolved.

19.   But there are many thorny questions that have to be decided before then.

20.   But those systems raise thorny questions.