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CLUES ACROSS:
1. Notch for the string at both ends of a bow [4]
6. Meaningful sequence of items[4]
9. Bump reader [12]
11. Combine, unite, join: [3]
13. Before [3]
14. Italian bowls [6]
17. Acts of deference or homage [10]
19. Conjunction, e.g. “I am neither especially clever _ _ _ especially gifted” (Einstein) [3]
20. Small steep-walled plateau [4]
22. See 4 Down
25 & 27 Down. This Skepchick visits Melbourne in Nov/Dec 2010 [7, 6]
28. Immediate ancestor [6]
29. Not a pool to swim in! [4]
31. Stage in a process of change or development [5]
32. Disease-producing microorganism. [8]
34. Liquid concoctions of dubious medical value; (also) deceptive talk or actions; hooey; bunkum (Two words [5], [3])
36. Stay [6]
39. Possess [3]
40. Large bodies of water [6]
41 & 53 Across. This Skeptoid visits Melbourne in Nov/Dec 2010 [5, 7]
43. This event is in Oz in November 2010
45. Bill of Fare [4]
47. Slippery Fish
50. Ration, allotment [5]
52 & 33 Down. This Skeptical musician, songwriter and podcaster visits Melbourne in Nov 2010 [6], [4]
53. See 41 Across
54. Twosomes [4]
55. Used for aquatic propulsion [3]
CLUES DOWN:
1. Lacking the power to feel [4]
2. Head appendage of a usually male bird; also variety of flower [7]
3 & 26 down. Unfortunate ABC TV series about alternative therapies [6], [7]
4 & 22 Faddish brand of wrist-band [5],[7]
5. Enemies [4]
6. Legal action against another person’s property [4]
7. Exists [2]
8. Eye ailment [4]
9. Greek letter; also Prefix denoting paranormal ability [3]
10. Object of knightly quests [5]
12. Charged atom [3]
15. Statements of belief [6]
16. Demanding [8]
18. Swindle [3]
21. Symbol for the element Scandium [2]
23. Energy field held to emanate from a living being [4]
24. Substance held to produce spirit materialization [9]
25. Restored after injury or ill health [11]
26. See 4 down
27. See 25 across
28. Teachers, usually of the dull or formal variety [10]
30. Drunkard [3]
33. See 52 across
35. Wheatstone bridge used for Dianetics and Scientology auditing [1], [5]
37. Citizen of Baghdad or Basra, for example [5]
38. “_ _!” quoth the Pythonesque knights [2]
42. Full of anticipation, eagerness or excitement [4]
44. Three-legged isle of tail-less cats [3]
45. Insane, OR intensely angry [3]
46. Non-governmental organisation (abb) [3]
48. The Self [3]
49. Grassland, pasture [3]
51. International organization concerned with cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace (abb) [2]
Solution Here: http://skeptics.cafe/puzzles/december-crossword-solution/