Imagine standing on sand. Sand can support your weight. It does move around a bit, and you do sink in a bit, but you will stop at some point. If you were smaller you’d be able to slip through the grains of sand. Cells, molecules, atoms, particles are all smaller, and smaller “pieces of sand”, that can be much closer to each other from our view, but still so small that they are, from a particle’s view, very far from each other.
Edit: refer to particle
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