21.   And once scientists have some answers, translating them to effective prevention and treatment will be another hurdle.

22.   And scientists have had scant success trying to understand the illnesses through a nongenetic approach.

23.   And scientists are having a difficult time making sense of even the most basic springs and gears of the genome.

24.   And until he can get a specimen or at least a picture, scientists will have nothing to check.

25.   Armstrong said that scientists likely will have preliminary results by early next year.

26.   As have other scientists, he pointed out that while the cell lines appeared healthy, it was still too early to be certain.

27.   As part of the project, DARPA scientists will have to make significant advances in miniaturizing aircraft components.

28.   As the tree of life has been redrawn, scientists have also had to revise some of their ideas about how evolution has proceeded.

29.   Astonishingly, with rare exception, scientists have had little to say about the proposed action.

30.   At least one method is already capable of finding planets as small as Earth, and scientists have high hopes that will pay off within months.