1. Keystone character

4. With 57-down, Tu B'Shevat-inspired theme of this puzzle

9. Part of David's weaponry

15. Actor Robert De ___

17. ___ Gay (World War II plane)

18. Like a football

19. Oil-producing group of trees

21. Exhausting

22. Swell up

23. Chemical ending

24. Monkey Trial name

25. Burns celebrated this John

28. Sound of a well-tuned engine

29. 911 respondent: abbr.

30. Hugs, symbolically

31. ___ vera

33. Concorde, e.g.

36. Mail abbr. for ambassadors

37. Infomercials, e.g.

38. News story starter

40. "I" problem

41. Crowd in old Rome?

42. And others, for short

43. Seedy Iranian dish

49. Getting closer

50. Question

51. Existed

52. Cereal with stars on its box

55. Loc. ___

56. Fu ___ (legendary Chinese sage)

59. Magazine no.

60. "So what ___ is new?"

61. Fire

62. Decide to leave, with "out"

63. Come together

64. Reaction of a sore loser

68. Sacred structure

71. Dog's warning

72. Asian palm

73. Gunpowder holder

74. Insult with a rude gesture

76. Daniel of Nicaragua

77. New York's ___ Fisher Hall

78. ___ deer

79. Pop performer?

80. King Cyaxares' subjects

81. Blog feed letters

1. Gnarly

2. Wick holder

3. Before

4. Line part: abbr.

5. Caruso et al.

6. Type of doll for revenge-seekers

7. Baby eel

8. Dumfries denial

9. Haphazard try

10. Person removed from a danger zone

11. Like many a Rubens subject

12. Radar image

13. Bowling alley unit

14. Units of work

16. Elliptical

20. Summer in France

26. Slangy greeting

27. Gymnast Comaneci

32. Café additive

33. In ___ (as found)

34. Become unhinged

35. ___ Aviv

37. "Act your ___!"

39. Many August babies

40. Poet Lazarus

41. Tattoo, slangily

43. Dismissive sounds

44. Mined finds

45. Norma and Charlotte

46. Beasts of burden

47. "Dallas" family name

48. Posed

49. Int'l conflict

53. Between 12 and 20

54. Against the law

55. Actress Tia

56. Desire, as an outcome

57. See 4-across

58. "Jumpin' Jack Flash..."

61. Like a winding road

63. Sarcastic taunts

65. Pointed arch

66. "Go team!"

67. Not worth ___ cent

68. Put in the overhead bin

69. "Take this!"

70. "Tat-tat" preceder

74. School of whales

75. Cobb et al.