1. The ratio of the distance traveled (in miles) to the time spent traveling (in hours).
4. Any plant of the genus Silene.
10. (computer science) A computer that is running software that allows users to leave messages and access information of general interest.
13. North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean.
14. Deciduous round-headed Asiatic tree widely grown in mild climates as an ornamental for its heart-shaped leaves and fragrant yellow-green flowers followed by hanging clusters of fleshy orange-red berries.
15. (used especially of commodities) In the natural unprocessed condition.
16. Polished and well-groomed.
18. An Indian side dish of yogurt and chopped cucumbers and spices.
20. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
22. A very poisonous metallic element that has three allotropic forms.
23. A soft silvery metallic element of the alkali earth group.
24. (of a young animal) Abandoned by its mother and raised by hand.
27. Advanced in years.
31. A master's degree in business.
33. 1/10 gram.
35. Any of various coarse shrubby plants of the genus Iva with small greenish flowers.
36. God of the Underworld.
38. Being ten more than one hundred forty.
39. Filled with the emotional impact of overwhelming surprise or shock.
42. Small terrestrial lizard of warm regions of the Old World.
44. Waterfall in Canada is the Horseshoe Falls.
45. A metrical unit with unstressed-stressed syllables.
46. (informal) Of the highest quality.
47. English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984).
51. Yellow-fever mosquitos.
55. A loose sleeveless outer garment made from aba cloth.
56. British writer noted for romantic adventure novels (1856-1925).
60. A rapid bustling commotion.
61. The use of nuclear magnetic resonance of protons to produce proton density images.
62. Small genus of dioecious tropical aquatic plants.
63. The cry made by sheep.
64. A condition (mostly in boys) characterized by behavioral and learning disorders.
65. Small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra.
66. The basic unit of electric current adopted under the System International d'Unites.

1. A small constellation in the polar region of the southern hemisphere near the Southern Cross and Chamaeleon.
2. Either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh.
3. Precipitation of ice pellets when there are strong rising air currents.
4. In the Arabian Nights a hero who tells of the fantastic adventures he had in his voyages.
5. The content of cognition.
6. Towards the side away from the wind.
7. A radioactive transuranic element produced by bombarding plutonium with neutrons.
8. A hard malleable ductile silvery metallic element that is resistant to corrosion.
9. Worn or shabby from overuse or (of pages) from having corners turned down.
10. Soft creamy white cheese.
11. A Chadic language spoken south of Lake Chad.
12. (informal) A bunch.
17. An amino acid that is found in the central nervous system.
19. A particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography).
21. An intensely radioactive metallic element that occurs in minute amounts in uranium ores.
25. God of love and erotic desire.
26. A former agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States.
28. An ancient Egyptian city on the west bank of the Nile opposite Cairo.
29. At any time.
30. An informal term for a father.
32. A flexible container with a single opening.
34. (Greek mythology) Goddess of the earth and mother of Cronus and the Titans in ancient mythology.
37. Type genus of the Amiidae.
40. Covered with paving material.
41. American novelist (1909-1955).
43. A city in western Germany near the Dutch and Belgian borders.
48. A United Nations agency created to assist developing nations by loans guaranteed by member governments.
49. A sudden short attack.
50. A card game in which players bet against the dealer on the cards he will draw from a dealing box.
52. A Chadic language spoken south of Lake Chad.
53. Mild yellow Dutch cheese made in balls.
54. A cleansing agent made from the salts of vegetable or animal fats.
57. Title for a civil or military leader (especially in Turkey).
58. God of the earth.
59. The former capital and 2nd largest city of Brazil.