| Sarah McLachlan song | 20 |
| United Nations' goal | 24 |
| Oct. 15 celebrations | 20 |
| Six billion and change | 22 |
| The United States, notably | 26 |
| United States of America, e.g. | 30 |
| G8 member, e.g. | 15 |
| First looks at Mars and Venus? | 30 |
| Olympian's achievement | 26 |
| Olympian's ultimate achievement | 35 |
| Olympian's achievement, perhaps | 35 |
| Athlete's ambition | 22 |
| Summit attendee | 15 |
| Wells' warring factions | 27 |
| The Veronicas "___ Apart" | 35 |
| Sides in a Wellsian war | 23 |
| Best of both ___ | 16 |
| "When __ Collide": 1951 sci-fi film | 45 |
| "The War of the ___" | 30 |
| ___ Fair (N.Y. 1939 event) | 26 |
| ___ fair (big show) | 19 |
| Very distant or different (and a hint to what's hidden among the Across answers, in their logical order, from top to bottom) | 128 |
| Separated by a wide chasm | 25 |
| Ripken won one | 14 |
| October sports event | 20 |
| Event for baseball's best teams | 35 |
| Baseball championship | 21 |
| 2004 event at which the jinx was broken | 39 |
| The next one takes place in Shanghai, 2010 | 42 |
| Site of the Trylon and Perisphere: 1939 | 39 |
| London had the first one in 1851 | 32 |
| Flushing Meadows exposition | 27 |
| Billy Graham had his own pavilion there in 1964 | 47 |
| Doctorow's international restaurant guide? | 46 |
| The subject of this puzzle, on 5/1/31, the day it opened | 56 |
| Meeting of global leaders | 25 |
| 2010 event featuring vuvuzelas | 30 |
| Collection of beliefs about life | 32 |
| International conflict | 22 |
| Global outbreak | 15 |
| Global conflict | 15 |
| A third one is the subject of many science fiction stories | 58 |
| Event ended with the Treaty of Versailles | 41 |
| Backdrop of "What Price Glory" | 40 |
| Enigma backdrop | 15 |
| Jimmy Doolittle, for one | 24 |
| 20th-century events | 19 |
| Skittish about almost everything? | 33 |
| 2013 apocalyptic film starring Brad Pitt | 40 |
| Attire at the UN? | 17 |
| Bored with existence | 20 |
| International | 13 |
| Global | 6 |
| Availability to anyone, anywhere | 32 |
| Surfers' place | 18 |
| Modern research tool | 20 |
| Information superhighway whose abbreviation inspired this puzzle's theme | 76 |
| Hyperactive arachnid's creation? | 36 |
| Actor Jack, circling the globe? | 31 |
| WORL | 4 |
| Ken Follett best-seller | 23 |
| For all eternity | 16 |
| 2007 Ken Follett novel | 22 |
| "Gloria Patri" phrase | 31 |
| Jo Anne of ''Laugh-in'' | 39 |
| Comedienne Jo Anne | 18 |
| One-nighters for Jo Anne | 24 |
| Robin's quest | 17 |
| It's not wanted in the big apple? | 37 |
| Apple invader | 13 |
| It may be on a hook | 19 |
| Early bird's breakfast | 26 |
| Word with inch or tape | 22 |
| One might get hooked | 20 |
| Mole's snack | 16 |
| Bird's find | 15 |
| Apple intruder | 14 |
| Antivirus software target | 25 |
| Wriggling bait | 14 |
| Word with book or silk | 22 |
| Word after silk or earth | 24 |
| Turner in a saw | 15 |
| Thing studied by a helminthologist | 34 |
| TEQUILA BOTTLE ITEM | 19 |
| Tequila bottle additive | 23 |
| Tequila additive | 16 |
| Tape or glow follower | 21 |
| Robin's prey | 16 |
| Poe's "conqueror" | 31 |
| Minnow alternative | 18 |
| Leech, e.g. | 11 |
| Invertebrate | 12 |
| Internet scourge | 16 |
| Inside of a jumping bean | 24 |
| He might get hooked | 19 |
| Fishing bait, perhaps | 21 |
| Fish's last bite | 20 |
| Early-bird's victim | 23 |
| Early bird's treat | 22 |
| Early bird's prize | 22 |