| ACROSS
1. Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916).
5. A loose sleeveless outer garment made from aba cloth.
8. A dark-skinned member of a race of people living in Australia when Europeans arrived.
11. Type genus of the family Unionidae.
12. Someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential).
13. The upper side of the thighs of a seated person.
14. A strong-smelling plant from whose dried leaves a number of euphoriant and hallucinogenic drugs are prepared.
15. The most common computer memory which can be used by programs to perform necessary tasks while the computer is on.
16. The compass point that is one point east of due south.
17. A person of unquestioning obedience.
20. A radioactive element of the actinide series.
21. Any of a group of antidepressant drugs that inhibit the action of monoamine oxidase in the brain and so allow monoamines to accumulate.
23. Large northern deer with enormous flattened antlers in the male.
25. A long thin fluffy scarf of feathers or fur.
26. (British) A waterproof raincoat made of rubberized fabric.
28. A gradual decline (in size or strength or power or number).
31. A software system that facilitates the creation and maintenance and use of an electronic database.
33. A federal agency established to regulate the release of new foods and health-related products.
36. The blood group whose red cells carry both the A and B antigens.
37. United States chemist who developed a method of radiocarbon dating (1908-1980).
43. Fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelopes the seed.
46. An associate degree in applied science.
47. The basic unit of money in Western Samoa.
48. A public promotion of some product or service.
50. Someone who works (or provides workers) during a strike.
51. A bachelor's degree in religion.
52. A vessel in which something is immersed to maintain it at a constant temperature or to process or lubricate it.
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DOWN
1. A doctor's degree in music.
2. Again but in a new or different way.
3. A medium (art or business) that disseminates moving pictures.
4. A minor Hebrew prophet (8th century BC).
5. A river in north central Switzerland that runs northeast into the Rhine.
6. (informal) Exceptionally good.
7. A defensive missile designed to shoot down incoming intercontinental ballistic missiles.
8. Thickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord.
9. A small cake leavened with yeast.
10. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
18. A city in western India just off the coast of the Arabian Sea.
19. A state in southeastern United States between the Atlantic and the Gulf of Mexico.
22. A metrical unit with unstressed-stressed syllables.
24. Large brownish-green New Zealand parrot.
27. A soft silver-white ductile metallic element (liquid at normal temperatures).
29. A small pellet fired from an air rifle or BB gun.
30. A soft silvery metallic element of the alkali earth group.
32. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
34. English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984).
35. A promontory in northern Morocco opposite the Rock of Gibraltar.
38. Divulge information or secrets.
39. Date used in reckoning dates before the supposed year Christ was born.
40. Common Indian weaverbird.
41. Influential German idealist philosopher (1724-1804).
42. United States writer (born in Poland) who wrote in Yiddish (1880-1957).
44. A workplace for the conduct of scientific research.
45. A condition (mostly in boys) characterized by behavioral and learning disorders.
49. A metallic element having four allotropic forms.
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