Just how small Is an atom? – By Jonathan Bergmann

https://ed.ted.com/lessons/just-how-small-is-an-atom

As a microbiologist, I’m intrigued by the very small. I asked that question a long time ago (see Bacteria Galore by Sunday at Four overleaf). And of course you know that the nucleus of an atom is much more than protons and neutrons, right? You might want to check out Brownian motion, that is an atomic (or almost atomic) phenomenon that you can actually see in a microscope!).