First Excited State
Extremely cool things we can know about the Universe with a bit of physics and/or mathematics already in the bank.
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“Tad is a real, honest-to-goodness astrophysicist and physics teacher - meaning, he's a FAR more reliable source of scientific research than I am. He describes his Substack as aiming at the "slightly more 'advanced' lay-person or students of the fields at, say, the sophomore or junior level" - but it's so piercingly clearly written that I'd say it's open to everyone. Delightfully nerdy and filled with wonder.”
Mike Sowden, Everything Is Amazing