| Science advocate Bill | 21 |
| Pulitzer author Russel | 22 |
| PBS's science guy | 21 |
| PBS science guy Bill | 20 |
| PBS science expert | 18 |
| PBS "Science Guy" Bill | 32 |
| Old-time humorist Bill | 22 |
| Noted science guy | 17 |
| Nevada county in which part of Death Valley National Park is located | 68 |
| Nevada county containing Yucca Mountain | 39 |
| Memorable funnyman Louis | 24 |
| Laugh maker Louis | 17 |
| Largest county of Nevada | 24 |
| Kidvid scientist Bill | 21 |
| Kids' TV host actually surnamed Rowe | 40 |
| Isolationist in the Senate: 1925–45 | 42 |
| Humorist who wrote "Baled Hay" | 40 |
| Humorist who sounds close | 25 |
| Historian Russel ____ | 21 |
| He's the science guy | 24 |
| Group of pheasants, in England | 30 |
| Gordon Hathaway portrayer on TV | 31 |
| Frequent ad-libber on "The Steve Allen Show" | 54 |
| Former Tonight Show regular | 33 |
| Flock of pheasants | 18 |
| Entertainer Louis | 17 |
| Comic with Poston and Knotts on "The Steve Allen Show" | 64 |
| Comic author Bill | 17 |
| Comedian Louis ___ | 18 |
| Carrie married to Cavett | 24 |
| Bill the 'Science Guy' | 30 |
| Bill or Louis of TV | 19 |
| Bill or Carrie | 14 |
| Bill on PBS | 11 |
| Bill of kidvid fame | 19 |
| Bill of educational TV | 22 |
| Bill in a bow tie | 17 |
| Bevan's nickname | 20 |
| Aneurin Bevan, familiarly | 25 |
| American humorist: 1850–96 | 33 |
| American humorist: 1850-96 | 26 |
| Actress Carrie ___ | 18 |
| Actor Louis | 11 |
| 19th-century humorist Bill | 26 |
| 19th C. humorist Bill | 21 |
| 1950s-'60s "Man on the Street" comic Louis | 56 |
| 1920's-40's North Dakota senator Gerald | 47 |
| 12/31, initially, or what is blacked out in this puzzle | 55 |
| 12/31, initially | 16 |
| "The Steve Allen Show" regular Louis | 46 |
| "The Eyes of ___" (public TV science show) | 52 |
| "The Eyes of ___" (2005 PBS science show) | 51 |
| "Steve Allen Show" veteran | 36 |
| "Steve Allen Show" regular | 36 |
| "Soft Power" author Joseph | 36 |
| "Science Guy" of PBS | 30 |
| "Great Big Book of Tiny Germs" author | 47 |
| "Bill ---, the Science Guy" | 37 |
| "Bill ___ and Boomerang" | 34 |
| "Baled Hay" humorist | 30 |
| ''Bill ___, the Science Guy'' | 45 |
| Louis and Carrie | 16 |
| Bill and Louis | 14 |
| Louis and Bill | 14 |
| Bill, Louis and Carrie | 22 |
| Carrie and Louis | 16 |
| TV's Science Guy and others | 31 |
| Humorist Bill et al. | 20 |
| Humorist Bill and others | 24 |
| Bill and Carrie | 15 |
| U.S. humorist and family | 24 |
| U. S. humorist Bill et al. | 26 |
| U. S. humorist and family | 25 |
| Science guy Bill's family | 29 |
| Science guy Bill and funnyman Louis | 35 |
| Louis, Carrie and Bill | 22 |
| Louie and Russell | 17 |
| Longtime North Dakota senator Gerald and others | 47 |
| Humorist et al. | 15 |
| Humorist Bill and family | 24 |
| Humorist Bill and comic Louis | 29 |
| Humorist Bill and comedian Louis | 32 |
| Historian Russell and others | 28 |
| Funny Louis and others | 22 |
| Comic Bill et al. | 17 |
| Comedian Louis et al. | 21 |
| Comedian Louis and family | 25 |
| “Bill ___ Red Book” (1906 publication) | 46 |
| Bill ___ Climate Lab (Oakland science exhibit) | 46 |
| Actress Carrie et al. | 21 |
| Actress Carrie and others | 25 |
| "Bill ___ History of the United States" (1894 humor book) | 67 |
| "Bill ___ History of the United States" | 49 |
| Kremlin veto | 12 |
| Russian refusal | 15 |
| Da's opposite | 17 |
| Russian veto | 12 |
| Rasputin's refusal | 22 |
| Duma denial | 11 |
| Russian denial | 14 |