Crossword: ''They're very close''

Can you tell which is which?

By MATT JONES | September 12, 2007

Across
1 Group hired to applaud a performance
7 He smacked Moe
12 Foretold the future
14 Revolutionary surname
16 Bill Nye is known as "The ___ Guy"...
17 ...while actor Bill Nighy costarred with many ___ in two recent movies
18 Sex educator Shere et al.
19 Makes it through
21 Scion compacts
22 James who played Sonny Corleone
23 Christmas tree, often
24 You was once this
25 Fumigation target
26 Kilt pattern
28 Map lines
29 Mark Wahlberg starred in the 1997 film "___ Nights"...
31 ...while Mark L. Walberg currently hosts PBS's "___ Roadshow"
33 Title beekeeper played by Peter Fonda
35 Robusto! food brand
36 Michael Haydn, brother of Joseph, was an Austrian ___...
40 ...while Gen. Michael Hayden is current director of ___
44 Far from fitting
45 Completely broken
47 Some naval officers: abbr.
48 Elwes of "Saw"
49 Zombie ingredient
50 AMA members
51 Putting Ernie
52 More drastic
55 1980s South African president P.W.
56 Henrik Ibsen was a playwright aligned with the ___ movement...
58 ...while Henry Gibson presented satirical poetry on the 1960s show "___"
60 New ___
61 Prominent
62 Anatomical in-between area, slangily
63 Heavy hammer

Down
1 Discovery Channel game show with a host/driver
2 Mob figure "Lucky" ___
3 Musical direction
4 Fool's Mate piece
5 They're a bunch of ash holders
6 Market gp. that included Belgium and West Germany
7 Diamonds, e.g.
8 Word on a towel
9 Costar of Teri and Felicity
10 "Grumpy Old Men" headliner
11 Go ahead of
13 She was "Gone," in a 1994 Johnny Cash song
14 Navigational tracker, for short
15 Determine value
20 "Nessun dorma," e.g.
23 Makes a quick getaway
24 Chef's hat
26 First show
27 Letters indicating a patient request
28 Direction Super Mario Bros. scrolls toward
30 Little fish
32 O'Neal of "Wicked Wicked Games"
34 "Oh no, a tarantula!"
36 Roman orator, or an Illinois city
37 At the ready
38 Cooking wine
39 Barely on the grill
41 Decent
42 Result of some joke-shop powders
43 Actor Armand of "The Mambo Kings"
46 Knitting stitches
50 He's roped by a cowpoke
52 Zoologist Fossey
53 Ceases to be
54 Abbr. in an apartment ad
55 "You're lying!"
57 Kilauea keepsake
59 ___ in "aardvark"