On August 28, I walked into the clinic. I took off my glasses—blind now—and lay on the table. The clinician strapped a molded plastic mesh mask to my face. She attached it to the table.
For the next 35 minutes, I lay completely still, pinned down. I closed my eyes. I could hear the mechanical arm of the CyberKnife machine darting and turning in the space above, below, aside, and over my head and face. Three-quarters of the way through I began to feel the radiation it was zapping into me: invisible, yet radiating, just like its name.