How time, ignorance, and death intersect, highlighting unique innovations and discoveries that offer hope and a moral compass.

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.