Atoms Aren't Empty

Kitty Oppenheimer: Can you explain quantum mechanics to me?
J. Robert Oppenheimer: Well, this glass, this drink, this counter top, uhh.. our bodies, all of it. It's mostly empty space. Groupings of tiny energy waves bound together.
Kitty Oppenheimer: By what?
J. Robert Oppenheimer: Forces of attraction strong enough to convince us [that] matter is solid, to stop my body passing through yours.
— IMDB quote from Oppenheimer
Flash forward to 2023, where Mario Barbatti is a theoretical chemist