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Italy rejected that explanation, even after the Egyptian police produced Mr. Regeni’s passport, which they said had been found in an apartment of one of the dead men, — indirect proof, Italian officials said, that the true culprits were with Egyptian security.

I was about to begin going over the steps of indirect proof when I heard Danny say, “You’re always sleeping! What a sleepyhead you are!” and I opened my eyes.

“I was just going into the indirect proof. Do you want to hear it?”

It’s uncanny but still indirect proof.

We cannot see these ancient behemoths directly with current technology, but we can, say astronomers, capture an indirect proof of their activity.