1 Unidentified Flying Object
3 This becomes #8 across
8 Monarch, swallowtail, painted lady, e.g.
11 Memoranda
12 America's began in about 1776
13 A break or opening, as in a fence or a wall
15 A center around which other things revolve
17 Bob Dylan said They are a-changin'
19 Electric, snake-like fish
20 Alice had many adventures in here
22 Corporate shorthand for Washington Mutual
23 Wise bird
25 Storytellers generate them
26 It waxes and wanes
28 Speak
29 What one does at a university
30 Lizards regenerate them
31 Universal Resource Locator