"What physical proof do you have of these ley lines?"

If she didn't have this baby, there would be no physical proof that he had ever existed.

Good old Dad ties the two families together, and what's the physical proof?

None of which are confirmed as there is no physical proof of his body.

"The expansion is physical proof of our ability to survive."

It's something we can look for, some solid physical proof.

Fire investigators said they had found no physical proof of arson.

We like to see physical proof of how people lived in the past.

If they beam someone aboard, we can show physical proof, and perhaps be free within a few hours.

More striking was the physical proof that no larger memorial would be built there: three new homes.