Across 1. In circle C having diameter NG, ___ is a semicircle 6. Physics subj. 10. Belonging to Leno’s netw. 14. “Scram!” 15. Shocking, bizarre (from Fr.) 16. ___phile (wine connoisseur) 17. (a + bi)/(c + di) = (ac + bd + (bc - ad)i)/(c² + d²) 20. CSI: ___ 21. Strident nationalist (spelled backward) 22. ___ You Being Served? 24. Dangerous hallucinogen (abbr.) 26. Part of DNE 29. Riskiest e-mail command 31. Of first degree 33. Sgt., e.g. 34. It may need MATH 9 and 0 (with 43 Across) 36. Cigar chomper’s buddy 38. Christian designer? 39. Typo, calc-o, or chalk-o 40. It goes to the IRS 43. See 34 Across 47. Combustion product 48. Surprised response upon seeing a toupee? 50. Photochemical ___ (pollution) 51. ___ mayonnaise 53. Architect of East Wing of National Gallery 54. What students lose for being tardy (abbr.) 55. G-man’s announcement (spelled backward) 57. AP exams are easy this often 61. Purpose of d/dx operator 66. Q-V connector 67. Name following Kerr or Fibber

68. Word that makes Lower Schoolers giggle 69. Sorrows’ counterpart 70. Accptd. for grading 71. Some kind of nerve? Down 1. Cinematographer’s letters in movie credits 2. Greek letter that looks like a curvy P 3. Not given in answer to sensitive questions 4. Sadness for pastry-loving mathematician? 5. Suitable for all audiences 6. To assist (Sp.) 7. Another good arg. in support of chastity 8. Tube w/ 3 electrodes: anode, cathode, grid 9. Revision following F (abbr.) 10. Tricky description of 2.718281828459045235 11. Antipodal city for Bahia Blanca, Argentina 12. CSAF’s nautical counterpart 13. What every student at an all-male school is 15. Better than aftermkt., presumably 18. Ti lead-in 19. Moment of ___ , a.k.a. second moment 22. ___ Lay Dying (Faulkner, 1930) 23. Stimpy’s best friend, despite abuse 25. Launching pad for Murphy, Aykroyd, Ferrell, etc., etc. 27. Math is considered a hard ___ (abbr.) 28. Digit 30. Jumbled “dude” 31. Scientology founder: init. + middle name + init. 32. “_____abed is a sleepyhead” 35. One that sticks a neck out? 37. Decides 39. Sought to see better 40. Indian word for prince (cf. Ger. Reich, L. rex) 41. That, to Señor Muñoz 42. Undisciplined : spirited : : stingy : ___ 43. Before, poetically 44. Edition 45. Z___ suit 46. Names of many Vietnamese 49. Each 52. _____cate (what many crossword clues do) 56. Abbr. of ’80s band (“Broken Wings,” “Kyrie”) 58. ___IO 59. Kaine domain (abbr.) 60. Crown of the head (spelled backward) 61. NBA’s Erving 62. Personal ad letters 63. Updated ver. of stargazers’ GC (General Catalogue of Nebulae and Clusters) 64. Monsieur Boussard’s assent 65. Dr. Rice’s org. betw. Stanford and State Dept. 71. Type of ring that doomed Challenger in 1986