Image description: Filaments of a bacteria named Thiomargarita magnifica, placed next to a dime for scale. It is the largest bacteria ever observed, and each filament seen here is a single cell.
Despite having visited the US many times, I have not the slightest idea of how big a dime is (or what it is worth), so it isn't a useful indicator of scale to me and, I suspect, much of the rest of the world.