The PicoRuler: Protein-based molecular rulers make it possible to test the optical resolution of the latest super-resolution microscopy methods on biomolecules in the sub-10-nanometre range under realistic conditions. (Courtesy: Gerti Beliu, DALL-E 3 / University of Würzburg)
If you want to measure an everyday object, you might use a ruler – a piece of material with a fixe
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Isabelle Dumé
is a contributing editor to Physics World