system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If atoms are mostly empty space, how can things be solid?
gpt
Think of a propellers blades spinning around but only way way way way way way way faster, a fan spinning looks like a solid and kind of acts like barrier nothing can pass though, small enough, tight enough together, enough of them, spinning fast enough, and in all directions, solid surface.