Go see a Forbes article about a robotic machine that cruises through a truck garden field zapping weeds with lasers while protecting the desired plants from harm. The objective: reducing the need for expensive and health-hazardous herbicides. It sounds benign.
Imagine applying the same technology to people - picking the undesirables for zapping. The machine can tell an onion from a carrot, why not a red from a blue? Somewhere Skynet smiles, considering the possibilities; Sarah Connor, it’s time for you and young John to go off the grid.
