| It may be gas-burning or hybrid | 31 |
| Snow Patrol song to rev you up? | 31 |
| Bridge builder, for one (Abbr.) | 31 |
| Historic name in supercomputers | 31 |
| Granddaddy of digital computers | 31 |
| Six women at Penn programmed it | 31 |
| Computer developed in the 1940s | 31 |
| Acronymic computer of the 1940s | 31 |
| "Giant Brain" of 1946 | 31 |
| Sir Geraint's faithful wife | 31 |
| Soprano Mitchell's hometown | 31 |
| Oklahoma city or writer Bagnold | 31 |
| Tennyson's Geraint and ____ | 31 |
| Geraint's significant other | 31 |
| Namesakes of Geraint's wife | 31 |
| It's something of a mystery | 31 |
| Photographer's order: Abbr. | 31 |
| Heading off to boot camp: Abbr. | 31 |
| Former Chinese premier Zhou ___ | 31 |
| "Belvedere of Sicily" | 31 |
| Persephone's abduction site | 31 |
| Del ____ NL RBI leader in 1950 | 31 |
| Ambient composer Brian or Roger | 31 |
| Producer for David Bowie and U2 | 31 |
| Collaborator of Byrne and Bowie | 31 |
| Ambient musician Brian or Roger | 31 |
| "Dune" composer Brian | 31 |
| One of Adam's grandchildren | 31 |
| Mushrooms used in Asian cuisine | 31 |
| Mushroom in some Japanese soups | 31 |
| Cajun cookbook author Prudhomme | 31 |
| Name associated with Little Boy | 31 |
| "___ Gay" (WWII B-29) | 31 |
| Double-bonded organic compounds | 31 |
| Third-generation Genesis figure | 31 |
| Slaughter with a powerful swing | 31 |
| Early 80's TV police comedy | 31 |
| Brian and Roger of musical note | 31 |
| " . . . Paradise ___" | 31 |
| "Rubáiyát" word | 31 |
| Donizetti's Lord ___ Ashton | 31 |
| Company that went under in 2001 | 31 |
| Professor 'iggins, to Eliza | 31 |
| Eliza's professor, to Eliza | 31 |
| Lt.'s inferior, in the Navy | 31 |
| The four in the seventh inning? | 31 |
| One of Tennessee's twosomes | 31 |
| Lowest commissioned USN officer | 31 |
| What every inning has three of? | 31 |
| Recent U.S.N.A. graduate: Abbr. | 31 |
| "Half-striper": Abbr. | 31 |
| 'Star Trek' rank: Abbr. | 31 |
| ''Manon'' duet? | 31 |
| Port south-southeast of Tijuana | 31 |
| Surrealist of the Les XX school | 31 |
| CNN intelligence reporter David | 31 |
| Tolkien's Skinbark, for one | 31 |
| Suffix with "respond" | 31 |
| "The door's open" | 31 |
| Aspiring collegian's hurdle | 31 |
| French word before deux or nous | 31 |
| ___ RÃos, Argentine province | 31 |
| Dish that's the main course | 31 |
| Battle of the bands' way in | 31 |
| Treelike beings of Middle-earth | 31 |
| Tolkien's Treebeard and kin | 31 |
| Tolkien's talking tree race | 31 |
| M.D.'s who may cure snoring | 31 |
| It needs to be addressed: Abbr. | 31 |
| Certain stationery manufacturer | 31 |
| Ballade's concluding stanza | 31 |
| They may be self-sealing: Abbr. | 31 |
| "Orinoco Flow" singer | 31 |
| "Book of Days" singer | 31 |
| Single-named New Age music star | 31 |
| "Watermark" chanteuse | 31 |
| "Orinoco Flow" artist | 31 |
| New Age singer of Elvish lyrics | 31 |
| “Caribbean Blue” singer | 31 |
| What '-ase' may signify | 31 |
| Fair hiring practice, initially | 31 |
| One billion years, in astronomy | 31 |
| Longest time span, geologically | 31 |
| One billion years, geologically | 31 |
| 1,000,000,000 years, in geology | 31 |
| Proterozoic or Archeozoic, e.g. | 31 |
| Long time, even in the singular | 31 |
| Billions of years, geologically | 31 |
| Superfund administrator (abbr.) | 31 |
| Org. with a Greenversation blog | 31 |
| Org. that monitors fuel economy | 31 |
| Org. that conducts many studies | 31 |
| Mike Leavitt is its head: Abbr. | 31 |
| Site of the Innoventions museum | 31 |
| Rapier with a three-sided blade | 31 |
| Weapon with a bell-shaped guard | 31 |
| Modern pentathlete's weapon | 31 |
| There's no real point to it | 31 |
| Olympic pentathlete's blade | 31 |
| Weapon with a three-sided blade | 31 |