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Across 4. Where a bug is most snug 6. Seattle-based outdoors retailer 9. Scenic backroad 10. Box made of bars 11. Vacuum maker 14. All-unifying physics supposition, abbr. 15. Six, in Japanese 16. Bhutanese wine 18. Victim of eponymous folk song "_____'s Gone" 21. Canine cosmonaut 22. Iliad's king of Troy 25. Quick and without warning 27. Lake-filled volcanic craters 28. By mouth (2 wds) 31. A fir tree, in Germany 35. A non-Jew 37. They can make apparel shiny 39. Wet, cold camper's best friends (2 wds) 40. Díaz de Vivar's Moorish honorific 43. Travelers' lodgings 45. Shuffle, slide, or move over 48. Body cavity of complex animals 49. Latin abbr., "what was to be shown" 50. Two-handed longsword 51. Mike or Neil DeGrasse 53. Urban, Pius, or John Paul 55. Compose creatively and intricately 56. One who is in debt to another 57. Avuncular personification of the U.S. government

Down 1. "Kill Bill" lead 2. Miners' bounty 3. Levantine eggplant appetizer (2 wds) 5. Israel's Iron Lady 7. Stage so as to appear criminal 8. Imperial unit of heat, abbr. 10. Indy pro football team 12. Pesky animals 13. Lean cut of pig loin 17. Simple or experience-less 19. Closely held beliefs or principles 20. A sea eagle 23. National wildlife refuge in Arizona 24. Armored gun emplacement 26. Opposite of yin 28. Trudge 29. Fisherman's call: "___ 'em in!" 30. Antivirus software analyses 32. Capital of Barbados 33. Rapper Yasiin Bey's ex-stage name 34. Horse's lower leg joint 36. Mine entrance 38. Type or kind 41. An island, in France 42. Soliloquy starters (2 wds) 44. Traffic jam alert, in California 46. A pancake 47. Cash, in Australia 51. Soft, soapy mineral 52. Carbon chemistry, students' abbr. 54. Tiny edible green spheres