BWS Puzzle 38: Midi Themeless #16

This puzzle has both standard rotational symmetry and diagonal symmetry. One coding project I'd like to work on (someday when I have time...) is a way to generate all grids of a certain size that have both those symmetries. Perhaps I could even tweak the code to ensure certain restrictions on word lengths and black square counts. If you're interested in working on that, too, let me know!

I think this one will be a little challenging for its size (9x9) but not too hard overall. I'll label it "hard" just in case, though.

[spoiler alert] For when you're done, here's a link to more info about Hedetniemi's conjecture, which is mentioned in 4-Down. My mathematical research these days involves similar ideas (Cartesian and strong graph products), so let me know if you're interested in learning more about that, too!

Enjoy the solve, and share if you do! Constructive feedback in the comments is always welcome.

Download links: [puz] [pdf] [solution] Direct link: [play online]

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BWS Puzzle 37: Phrases of Physics

Huzzah, a full-sized, themed puzzle! I tend to post mostly midi-size puzzles on here, but I doubt there's really a good home elsewhere for this particular puzzle. As the title indicates, you will be well served by any prior knowledge of physics, science, and mathematics, but you don't need any such expertise to solve the puzzle. It would just really help because, in addition to the theme answers, I peppered the fill with plenty of science-related entries and clues. (In particular, [spoiler alert] you may want to look back to this post about my puzzle on 7xwords for more info about one entry in this puzzle.) You may also notice one blemish of asymmetry here: there's an extra black square just to the left of where 66-Across begins. I didn't need to add this to make the grid fillable at all, but I did need it to make the entries in that corner more reasonable and science-related. I'm hoping that, like me, you either won't care/notice at all, or you'll thin...

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