| ACROSS
1. The 7th letter of the Greek alphabet.
4. A dark-skinned member of a race of people living in Australia when Europeans arrived.
7. Someone who works (or provides workers) during a strike.
11. A slight amount or degree of difference.
12. A reproach for some lapse or misdeed.
13. The basic unit of money in Ethiopia.
14. The compass point that is one point east (clockwise) of due north.
15. Hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella.
16. South American wood sorrel cultivated for its edible tubers.
17. The branch of computer science that deal with writing computer programs that can solve problems creatively.
19. A radioactive element of the actinide series.
21. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
26. A Russian prison camp for political prisoners.
27. The mission in San Antonio where in 1836 Mexican forces under Santa Anna besieged and massacred American rebels who were fighting to make Texas independent of Mexico.
30. A loose sleeveless outer garment made from aba cloth.
32. According to the Old Testament he was a pagan king of Israel and husband of Jezebel (9th century BC).
33. Offering fun and gaiety.
36. A former monetary unit in Great Britain.
38. A public promotion of some product or service.
39. A radioactive transuranic element.
40. Arboreal snake of central and southern Africa whose bite is often fatal.
44. A long depression in the surface of the land that usually contains a river.
48. A river in north central Switzerland that runs northeast into the Rhine.
49. One of the most common of the five major classes of immunoglobulins.
51. A reptile genus of Iguanidae.
52. A former agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States.
53. A small cake leavened with yeast.
54. A workplace for the conduct of scientific research.
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DOWN
1. An inactive volcano in Sicily.
2. A sock with a separation for the big toe.
3. A sweetened beverage of diluted fruit juice.
4. (Judaism) Sacred chest where the ancient Hebrews kept the two tablets containing the Ten Commandments.
5. Obvious and dull.
6. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
7. A metallic element having four allotropic forms.
8. A federation of North American industrial unions that merged with the American Federation of Labor in 1955.
9. Type genus of the family Arcidae.
10. (informal) Exceptionally good.
18. Large brownish-green New Zealand parrot.
20. West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice.
22. Large lipoproteins rich in triglycerides.
23. Title for a civil or military leader (especially in Turkey).
24. A soft silvery metallic element of the alkali earth group.
25. The longer of the two telegraphic signals used in Morse code.
28. Informal terms for a mother.
29. A Russian river.
31. The blood group whose red cells carry both the A and B antigens.
34. A condensed but memorable saying embodying some important fact of experience that is taken as true by many people.
35. (informal) Of the highest quality.
37. A member of the Siouan people formerly living in the Missouri river valley in NE Nebraska.
38. A metallic element having four allotropic forms.
41. A heavy long-handled hammer used to drive stakes or wedges.
42. A Chadic language spoken south of Lake Chad.
43. An Arabic speaking person who lives in Arabia or North Africa.
45. Resinlike substance secreted by certain lac insects.
46. A state of southwestern India.
47. A compartment in front of a motor vehicle where driver sits.
50. A soft gray ductile metallic element used in alloys.
51. A silvery ductile metallic element found primarily in bauxite.
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