There is a technology that keeps coming back. It appears in a 1920s laboratory, vanishes under institutional fire, reappears in a 1990 patent, lives for decades in garages and small clinics, and then, in 2026, shows up on a catheter inside a living vein. The latest version is a magnetically driven millirobot whose cilia stir circulating tumor cells out of the bloodstream in real time. The idea behind it is older than most of the people who will read this sentence. For a century, medicine has treated the body as a chemical factory. Drugs in, symptoms out. That model built modern hospitals and saved millions of lives. It also left an entire class of observations on the cutting-room floor: that cells run on voltage, that pathogens have electrical surfaces that can be altered without poisoning the host, that frequency and current can change inflammat ...