1.   A major activity of psychological research is to try to clarify the nature of constructs and verify their existence.

2.   Holmes repeated his experiments to verify the existence of atoms.

3.   Astronomers will also try to verify existence of an abundance of primordial hydrogen and helium gas scattered throughout interstellar space.

4.   But the trustee hired by Spano, a lawyer, could not verify the existence of the trust, where the money was or whether there was any money.

5.   Gravity waves have never been directly detected, and they are so faint that no instrument yet built is sensitive enough to verify their existence.

6.   The bank has verified the existence of the accounts.

7.   Their sources had captured a Laotian civilian from the area who, according to the CIA, verified the existence of the cave.

8.   U.S. officials in China say that no one monitoring violators has actually seen or verified the existence of any newly discovered factory.

9.   It also wants to verify the existence of other mass graves from the massacre.