HackerTube / Video
Your toothbrush is worn-out!
Applied Science
Ben Krasnow of Applied Science uses a scanning electron microscope to compare new and worn toothbrush bristles. He shows how the microscopic texturing wears down with use.
HN commenters link it for electron micrographs of fresh versus worn bristles when toothbrush wear comes up.
4 Hacker News mentions · 2023–2025