Across 1. Scorch 5. Words of understanding 9. It is measured in g or kg 13. Spelunking venue 14. Local maxima 16. Bart’s bus driver 17. Hoof sound 18. Sea eagles 19. Fe 20. Something to try if residual plot is bowl-shaped 23. Sets of points that satisfy specified conditions 24. Boot-shaped country 25. Branded PB&J component 28. Ordered pair with a large |residual| 32. Big name in vacuums 34. ISP traffic, often 35. Prefix for meter or normal 39. Homer’s employment? 43. Jacob’s twin 44. Moroccan city 45. Reef island 46. Sang like Ella Fitzgerald 49. Understand 50. Laboratory vessel 54. One of two Acela carriers 56. It may cause a common response 63. 43,560 square feet 64. DNE (plural contraction) 65. Raise 66. It may be furrowed 67. Microsoft monthly release 68. Organized toughs 69. Mends 70. Bucks’ interest

71. 7:1, for example Down 1. USSR, in pre-1990s Olympics footage 2. It was popular before WoW 3. Assert 4. Drive away 5. Précis 6. “___ is!” 7. Made vocal music 8. Person who gives the green lt. 9. Damp 10. Chambers near ventricles 11. It is better with 3 legs than with 4 12. Junior, to his parents 15. Antipode to NNW 21. Some chessmen 22. Not a bad way to address a male teacher 25. San ___ (extremely common place name: 4611 hits on gnswww.nga.mil) 26. Colored part of the eye 27. Org. blamed for bungling Katrina response 29. Composer Franz 30. Mischievous or fiendish one 31. That, to Señor Muñoz 33. Brains of a PC 35. Tap 36. Brouhahas 37. Audition taker’s goal 38. Wheel support 40. Cubicle farm (abbr.) 41. Teachers’ org. 42. In any circle, these are congruent 46. Schuss 47. Students’ state, too often 48. Rare ___ (scandium, yttrium, and most lanthanides) 50. Abs in the off-season? 51. Profit, usually used disparagingly 52. Item in a quiver 53. Makes asymmetric 55. Key ___ 57. Not a good thing to take during class 58. Alumnus 59. Nix 60. Pierced bauble 61. Alight 62. Work units