11.   Some scientists doubt that primates are capable of such sophisticated communication.

12.   Some flu scientists doubt the knowledge will be much use in the future.

13.   Some scientists doubt both the timetable and the economic claims.

14.   Some scientists doubt that native grasses and sagebrush will ever come back and compete with the introduced species.

15.   Some scientists doubted that Eosimias was a primate at all.

16.   The galaxy found by the Hubble ranks as the most distant object ever seen by humans, although few scientists doubt that this mark will soon fall too.

17.   But many scientists doubt it.

18.   Political scientists doubt that anger over affirmative action is keeping the race close.

19.   Some scientists doubt, however, that it will be as easy to direct the growth of adult cells as it is to manipulate embryonic stem cells.

20.   But other Italian scientists Saturday doubted the reliability of the latest reported claim.