the laws of Physics and Chemistry stay unchanged over time. We just need to elucidate them.
Thank you Mary.

Hrmph! Well, from an almost-60 perspective, the elucidation keeps changing! Dark matter! Dark energy! Fifth forces! WHAT DO YOU MEAN F ONLY KIND OF EQUALS MA? There are fundamental things that just shouldn’t change, dammit!

You kids get off my (regular matter made with Rutherford atoms) lawn! Git!

[embittered physics major, class of 1980]

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