Dual Singularities

Be wary of the creative physics in this part of Zyzzlvaria; you may not end up where you expect.

ACROSS
1. The Metamorphosis author's first name... / ...and his last name
6. Intro to physics? / "Life In Hell" character
11. Ball counterpart / Heights of dispute
16. Dude who's totally pathetic / ___ ease
17. Brace (oneself) / Talk to Marcel Marceau?
18. Benjamin / Zesty sauce
19. Cottonwood relative / Dead meat
20. Cavity Sam's stomach / They've got eagles on them
22. Girl who hasn't come out yet / It has a Biotechnology Index
24. Like Mr. White from The Venture Brothers / Peruse again
25. Lids purchase / Treasury Dept. bureau
26. Some champagnes / X-rated
28. Part of NRA / Steve's partner
30. Bring on / First firstborn
33. Delight in / "...lest you face the consequences!"
35. Aleve alternative / Deschanel series
39. Big Blue / ___ corda
40. Brain check? / Defeat decisively
41. All there / TV show with six recurring numbers
42. Flatfoot / Sandwich name that originated as diner slang
43. Eliminated from Project Runway / Raincoat
44. Drops in the morning / T-shirt size
46. Babylonian base / Inclinations
47. 2007 Radiohead track / Whence "You'll Never Walk Alone"
50. Maya Rudolph's voice role in Shrek the Third / Reveals
52. Contacts by phone / Diminish
53. Disencumber / Uncle known for pointing
55. Holiday beverage / Pre-school?
56. It's unrefined / Wall-E's beloved
57. Conformity tester Solomon / Johnnycake
58. Clogs / Eye holder
60. It's full of eau / Old Etonian ingredient
61. Bundle of grain / Mlles, across the Pyrenees
63. Ludlum creation / Find (out)
64. Bits of resistance / Haagen-___
65. Cardassian government head after Dukat / One paying attention
67. Country rocker Steve / Shape for a church dome
69. Amendment XVIII opponent / For
72. Shabbos goy, e.g. / Tiptoeing venue?
74. Opposite of "lest" / Really not built to last
78. Artistic medium filled with aluminum / Movie featuring Gary Oldman as a hijacker
81. Speak from a soapbox / Tribe of Israel
82. 2006 Best Picture nominee / Conseco Fieldhouse athlete
83. Cause for a sigh / He's got the whole world in his hands
84. Frankincense or myrrh, for example / Lynch mob, perhaps
85. Funny Girl songwriter / Shopping center
86. Condition / Self-titled album beginning with an asterisk
87. Catches sight of / Prelude to "Gesundheit"
DOWN
1. Another name for a Browncoat / Creatures in the "St. Ives" riddle
2. Common All-Star surname / Tabula ___
3. Roadies' loads / Spare tire
4. Are necessarily / Director who co-wrote Return of the Jedi
5. Floral oil / Spaced (out)
6. PD communication / Substance found in some trays
7. Operation Wunderland locale / Take by surprise
8. Prefix with cast or gram / Songwriter Jacques
9. Checked a page for updates / Color mentioned in "America the Beautiful"
10. Getting on a bit / Night flight
11. It was part of New France / Micro Machines creators
12. IV hooker-uppers / Novel that inspired There Will Be Blood
13. The Squid and the Whale director Baumbach / Trickster god
14. It was the first of its kind to have a pivoting head / Oriole, e.g.
15. Comic strip featuring Jeremy Duncan / Hotbed
21. Clip-___ (ties for losers) / Song that inspired "Weird Al" Yankovic's "Fat"
23. Tu ___ (logical fallacy) / Very very unrevealing women's garments
27. Cease-fires / Jock's pride
29. Automotive disaster / Firth or Farrell
30. Brood X members / Items often stolen by teens
31. Close to motherhood / Do away with
32. Daily grind / It may cause one to need a bigger cup
34. It'll take you on a trip / Something Ferris Bueller does not condone
36. Painter with an eponymous museum in Amsterdam / Skin care brand
37. Brat Packer / Meantime
38. Diminishes / Hairdressers, e.g.
40. Radio host fired in 2007 / Unit of loudness
45. Shade / Shoplifter Ryder
46. Gets to / Haggis ingredient
48. Ingredient in Fat Free Pringles / "___ to Be You"
49. Befuddle / Some HP printers
51. Constituency / Flowery, in a way
54. "How ___ Want It" (2Pac song) / Scratch
59. "SOS" singer last summer / Ultrashort do
62. Badenov's partner / State bordering Arizona
63. Competes with a sabre / From southeast Europe
64. "Just a moment!" / Excessive
66. 3000 to a Roman to a Greek? / Rocky outcrop
68. Butler's love / Some samples
69. Fly traps / "Joe ___" (Elegies song)
70. Coup d'___ / Irani money
71. Pinkberry alternative / Shamu, e.g.
73. Participating in multiple relationships / Volcano near Messina
75. Diner staple / Mr. Moto catchphrase
76. Former Spanish currency / Go ___ (fight)
77. Change for a twenty / Sandwich for dessert
79. Frustum-shaped article of clothing / Layer
80. Hop to it / Letters near F1, perhaps