11.   Despite heightened awareness and new government initiatives, Lederberg worries that too many barriers exist to developing new antibiotics and other disease-fighting drugs.

12.   Discrimination against people with HIV exists to some degree in most countries around the world.

13.   Even DiGaetano admits, however, that the giant shadow still exists to some degree.

14.   Experts say slavery has long existed to some extent in Sudan, often involving Muslim masters and slaves who are Christians or animists.

15.   Four generations of New Englanders have suspected the Boston Red Sox exist merely to lure and then torture them.

16.   In fact, the devices exist to bogus bills.

17.   In Washington, plenty of opposition exists to the more basic notion of eliminating the barriers that separate financial businesses.

18.   No nationwide system exists to track whether benefits have been received in other states.

19.   Of course, a formidable obstacle exists to any company dominating Broadway too grandly, and that has to do with seats.

20.   Practical barriers exist to boosting Latino voter turnout.