1.   There was a vast distance between psychological clues and concrete proof.

2.   At the news conference, no speaker was able to provide concrete proof that Internet piracy was affecting sales.

3.   Because it sometimes runs in families, scientists had suspected that at least some macular degeneration was inherited, but the new research is the first concrete proof.

4.   But some Western diplomats and U.N. officials say that they have yet to see concrete proof of these allegations.

5.   He intended to collage it into a future work, providing concrete proof that repression sustains what it seeks to destroy.

6.   If true, it would offer concrete proof that he survived the first waves of the American bombing campaign in Afghanistan.

7.   In other words, there has been no concrete proof that homocysteine is causing the damage.

8.   The Japanese government today offered the first concrete proof of that.

9.   The museum and the FBI said they would negotiate only if Youngworth provided concrete proof that he had the goods.

10.   The Townsend case, coupled with all the other risks, offers frighteningly concrete proof why computers need to be in public spaces where parents can monitor activities.