E=MC²

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Across
  1. 1. TROPHY
  2. 5. SOCIAL OR NATURAL
  3. 7. DESSERT
  4. 10. CYGNUS X-1 FOR ONE
  5. 12. HOOF GUARD
  6. 13. SENSES BY SOUND
  7. 15. TEXAS BALL PLAYER
  8. 17. GENERAL OR SPECIAL
  9. 19. WHERE X IS
  10. 21. RODEO GEAR
  11. 24. MOVE QUICKLY
  12. 27. FIREBALL RISES IN IT
  13. 30. ENGLISH PHYSICIST
  14. 31. ITS ON A WATCH
  15. 32. POLISH SMOOTH
  16. 33. MILK OR BREAD?
  17. 35. LONE SHOOTER
  18. 37. WORD OF PAIN
  19. 40. POLITICAL PERCEPTION
  20. 42. ONE MEANING FOR 'C'
  21. 45. DESERT MOUNT
  22. 46. LOSE IT
  23. 49. THIS REALLY SUCKS
  24. 50. A HOLD'S HOLD
  25. 51. DRESS OR PLAID
  26. 52. JENNIFER GARNER SERIES
  27. 54. PROFESSIONAL PLAYER'S TOOL
  28. 55. ROUGHNECK'S ICON
  29. 57. COLLECTION
  30. 58. 'A FEW GOOD MEN' CO-STAR
  31. 59. ___BLUE
  32. 60. SOMETIMES REQUIRES A BOOST
Down
  1. 2. UNTOUCHED
  2. 3. PRUDENT
  3. 4. STOCK HOLDER
  4. 6. COLLEGE MAJOR
  5. 8. 128 CUBIC FEET
  6. 9. KIND OF PAPER
  7. 11. TEE TIME
  8. 12. NOT AS LONG
  9. 13. EIGHT BITS
  10. 14. HAIR LINE
  11. 16. TO BE TAKEN IN THE KITCHEN
  12. 18. ENCOURAGING OR SARCASTIC WORDS
  13. 19. DARING FEAT
  14. 20. DENTIST'S REQUEST
  15. 22. SOMETIMES PRECEEDED BY A HALF
  16. 23. TYPE OF FISH USED IN SALADS
  17. 25. PIN ON ANOTHER
  18. 26. ENCLOSED
  19. 28. EXHAUSTED
  20. 29. YOU PITCH IT
  21. 33. A REGAL TITLE
  22. 34. BONES SOUND
  23. 36. TALK TO MUSIC
  24. 38. NFL INFRACTION
  25. 39. WITH ALL DUE RESPECT; ONE BEER MUG
  26. 40. POOH'S PAL
  27. 41. A SORT OF CURE
  28. 43. IT SPINS
  29. 44. DASH DEVICE
  30. 47. PREFIX FOR ROOM OR GAME
  31. 48. MEANS OF SUPPORT
  32. 50. A WAX FIGURE?
  33. 51. MILL PRODUCT
  34. 53. A ROOMY PLACE
  35. 56. FRANK
  36. 57. GO UNDER