Our senses tell us that everything is solid. Just pick up a rock and try to understand how there’s actually nothing solid to it and that it’s all empty space in reality. It’s difficult to imagine. The secret is in the electrostatic field that surrounds the atoms (i.e., the orbiting electron cloud). When two atoms come close together, their electron clouds repel each other so that the nuclei never actually touch. But you, holding that rock in your hand, feel that it’s very solid, as if you’re touching it. What’s actually happening is that you are feeling the sensation of electrostatic repulsion
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