Across 1. Se ___ español 6. Many are Yellow 10. ___ guy (indispensable person) 14. IM alternative 15. Large lot in town 16. Column type 17. AST corollary: Magnitude of error term is bounded by the magnitude of the ___ 20. Elementary 21. Someday 22. Call before raising 24. Slurps, as water 27. Reputations 28. He of the razor 31. Quelque chose en hiver 33. Large electronic security corp. 34. Mercury model 36. Make noise 38. Firmware accuracy specifications 41. “Set me as ___ upon your heart ...” 42. Lake in an island 45. Political philosophy, especially of the extreme kind 48. Groomsman 50. Composer Anderson 51. Tread heavily 53. Taxpayer ID 55. Surprised sounds 56. Establish officially 58. “___ America singing ...” 61. a + bx + cx² + dx³ + ... 66. And others (abbr.) 67. Entice 68. Guitar ancestors

69. Slings words rhythmically 70. Pb 71. Eye maladies Down 1. Hugh, familiarly 2. French friend 3. Possibly the most frequently misspelled English word 4. Macintosh predecessor 5. Opts. 6. Moulin Rouge dance 7. ___ Ventura 8. Sis nemesis, perhaps 9. Big truck 10. Must, slangily 11. Maxima or minima 12. Overflowed 13. Most peculiar 18. Lubricate 19. Hellish 22. Assn. 23. Author Umberto 25. Calculi 26. Feed storage structure 29. Taj Mahal locale 30. Skin pouches 32. France, once 35. Egg masses 37. Bono colleague 39. Words of cheer? 40. Panty raid target, perhaps 43. Aahh partner 44. Abbr. for entity that owns and ferociously guards the famous "I [heart symbol]" trademark 45. Molecule having same chemical formula but a different shape 46. Layers 47. Zany 49. Poured 52. Some centers 54. Sr. yr. org. 57. Empty solution 59. Slippery sliders 60. Stuck in ___ 62. Wish undone 63. A Gershwin 64. Really big shoe 65. Sound of air escaping