1.   New archaeological discoveries prove the existence of an ancient civilization in the Indus Valley.

2.   The parity-violation experiments, however, do not prove the existence of the charged W particles.

3.   These pictures do not prove the existence of water on Mars.

4.   This is an interesting theorem which seems to prove the existence of singularities for a large class of colliding plane waves.

5.   It is impossible to prove the existence of God.

6.   The major difficulty in practice is that of proving the existence of such rings.

7.   A spurt of water molecules from the crash would prove the existence of water on the moon.

8.   According to federal law, designation is supposed to go to tribes that can prove continuous existence as distinct social and political communities since first contact with European settlers.

9.   All the visits, she contended, were intended only to prove the existence of an afterlife.

10.   But he is the first to admit that he is not an expert in biology and that he is waiting for others to prove the existence of nannobacteria.