"What makes Time, Ignorance, and Death inevitable?

Do they have something in common?

A pioneer of reducing that deadly "something" leads a short tour of where it's found--and displaced.

Sayre's tour visits some unusual places. An immigrant neighborhood builds a microgrid. A remote radio telescope solves how to detect intelligence in the universe. A quantum mystery is resolved by our own incomplete view. All are related.

The tour's destination is a moral compass, and hope in tragedy. "