11.   The issue has divided weapons scientists within the Energy Department.

12.   But scientists are divided on the issue, and numerous countries with troops in the Balkans have launched testing programs.

13.   Scientists are divided about how the network, called Nirgal Vallis, was carved.

14.   Scientists are divided over whether a diet drug allegedly used by Denver Broncos linebacker Bill Romanowski could be abused.

15.   Scientists are divided over whether the testing poses any significant health or environmental threat.

16.   Scientists are divided about why the quagga developed its unusual coat.

17.   Scientists have been divided over the treatment, called transmyocardial revasculation.

18.   The question has divided scientists for years, he said.

19.   The Roman Catholic Church has not recognized the shroud as a holy relic, and scientists are divided over whether it is genuine.

20.   Scientists are divided over how to tackle an old manifestation of the curse of King Tutankhamon -- a plague of black spot covering his tomb.