As a contributor to Popular Science’s reviews team, Terri Williams covers all things tech, from good doorbells to webcams. She’s also offered analysis for Popular Science’s Best of What’s New awards. The six interchangeable heads include flat with acupressure, u-shape, trigger point, giant spherical, small spherical, and wedge. Alternative cures, together with acupuncture and chiropractic… Continue reading Best Back Massagers For Seniors: A Guide