Why Is Matter Stable?

It’s always the simple questions that get you, isn’t it? When my daughter was asked in her chemistry homework why, if atoms are mostly ‘empty’, solids are not inter-penetrable, I could see this was a good way to explore how well she’d grasped concepts like force. Since she hasn’t yet encountered Pauli’s exclusion principle, she wasn’t expected to have the conceptual tools for a more complete answer.

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