| Dec. 31 |
| Da opposite |
| Actor Louis |
| Bill on PBS |
| Ham debater |
| Funny Louis |
| Louis or Bill |
| Humorist Bill |
| U.S. humorist |
| Nevada county |
| Bill or Carrie |
| D.C.-born Bill |
| TV Science Guy |
| TV comic Louis |
| U. S. humorist |
| Louis or Carrie |
| Scientific Bill |
| Bill of science |
| Comic Louis ___ |
| The Science Guy |
| Carrie or Louis |
| 12/31, initially |
| Bevan's nickname |
| PBS "Science Guy |
| TV's Science Guy |
| Bill born in D.C. |
| Comic author Bill |
| Entertainer Louis |
| Laugh maker Louis |
| Noted science guy |
| PBS's science guy |
| Bill in a bow tie |
| TV scientist Bill |
| Actress Carrie ___ |
| American humorist. |
| Comedian Louis ___ |
| Flock of pheasants |
| December 31: Abbr. |
| PBS science expert |
| Science Guy" of TV |
| Group of pheasants |
| Baled Hay" humorist |
| Science Guy" of PBS |
| A ____ of pheasants |
| Bill of kidvid fame |
| Bill or Louis of TV |
| Science pundit Bill |
| TV science educator |
| He's the science guy |
| PBS science guy Bill |
| Scientific American? |
| Actor-comedian Louis |
| Carrie of "Creepshow |
| ''Science Guy'' Bill |
| A brood of pheasants |
| Early TV comic Louis |
| The Science Guy" Bill |
| 19th C. humorist Bill |
| Historian Russel ____ |
| Kidvid scientist Bill |
| Science educator Bill |
| Science promoter Bill |
| TV 'Science Guy' Bill |
| The Science Guy on TV |
| Bill of science shows |
| Old TV comedian Louis |
| Science advocate Bill |
| Bill ___ and Boomerang |
| Bill promoting science |
| Old-time humorist Bill |
| Pulitzer author Russel |
| Bill of educational TV |
| Emmy-winning scientist |
| Bill, TV's "Science Guy |
| Funny Louis of early TV |
| Humorist of the 1880's. |
| Scientist with 19 Emmys |
| Stand-up comedian Louis |
| Science rules!" speaker |
| TV's 'Science Guy' Bill |
| Nevada's largest county |
| Blogger on planetary.org |
| Carrie married to Cavett |
| Celebrity scientist Bill |
| High-energy TV scientist |
| Largest county in Nevada |
| Largest county of Nevada |
| Memorable funnyman Louis |
| Bill ___ Saves the World |
| U.S. humorist: 1850–96 |
| Netflix series scientist |
| Soft Power" author Joseph |
| Steve Allen Show" regular |
| Steve Allen Show" veteran |
| Aneurin Bevan, familiarly |
| Bill of educational shows |
| Countdown time, for short |
| Humorist who sounds close |
| Mr. Bevan to his friends. |
| Netflix science show host |
| 19th-century humorist Bill |
| American humorist: 1850-96 |
| Comedian Louis of early TV |
| Science guy with a bow tie |
| TV scientist with 19 Emmys |
| Bill who's a science expert |
| Netflix science series star |
| Bill who's "the Science Guy |
| Emmy-winning scientist Bill |
| American humorist: 1850–96 |
| Bill who popularizes science |
| The Steve Allen Show" regular |
| ''Bill ___, the Science Guy'' |
| Bill of the Planetary Society |
| Humorist who wrote "Baled Hay |
| Scientist/TV personality Bill |
| Scientist with multiple Emmys |
| Former PBS host with a bow tie |
| Group of pheasants, in England |
| The Planetary Society CEO Bill |
| TV educator Bill in a lab coat |
| Bill who promotes science on TV |
| Gordon Hathaway portrayer on TV |
| Nevada's largest county by area |
| Science advocate with a bow tie |
| Emmy-winning "Science Guy" Bill |
| 2017 "world-saving" Netflix host |
| Big name in antiscience debunking |
| Former Tonight Show regular |
| Scientist Bill with a show on PBS |
| The Steve Allen Show" regular Louis |
| Netflix's "Bill ___ Saves the World |
| Scientist with a ballet-shoe patent |
| Times Square ball drop time (Abbr.) |
| Great Big Book of Tiny Germs" author |
| Kids' TV host actually surnamed Rowe |
| 1950s-'60s "Man on the Street" comic |
| Scientist on "Dancing with the Stars |
| Host of the web series "Emoji Science |
| Isolationist in the Senate: 1925–45 |
| Netflix's "Saves the World" scientist |
| 1920's-40's North Dakota senator Gerald |
| Nevada county containing Yucca Mountain |
| Barometer in a Bottle" home-demo offerer |
| Bill ___ Saves the World" (Netflix show) |
| The Eyes of ___" (2005 PBS science show) |
| TV scientist whose show has won 19 Emmys |
| The Eyes of ___" (public TV science show) |
| Bill often seen in a lab coat and bow tie |
| Night to make ludicrous promises, briefly |
| Bill ___ the Science Guy" (1990s TV show) |
| 1950s-'60s "Man on the Street" comic Louis |
| Bill ___ Saves the World" (Netflix series) |
| Bill who promotes science on a Netflix show |
| Frequent ad-libber on "The Steve Allen Show |
| Louis who often had Steve Allen in stitches |
| Bill ___ Saves the World" (Netflix talk show) |
| Actress Carrie who was married to Dick Cavett |
| Bill who sells "Science Is Universal" T-shirts |
| Honorary co-chair of the 2017 March for Science |
| C.E.O. of the Planetary Society starting in 2010 |
| Comic with Poston and Knotts on "The Steve Allen Show |
| 12/31, initially, or what is blacked out in this puzzle |
| Nevada county with part of Death Valley National Monument |
| Science Guy" Bill who's competing on "Dancing with the Stars |
| Bill ___ Saves the World" (upcoming Netflix science talk show) |
| Science Guy" Bill who competed on "Dancing with the Stars" in 2013 |
| Undeniable: Evolution and the Science of Creation" author Bill ___ |
| Bill who once danced to "Weird Science" on "Dancing With the Stars |
| Unstoppable: Harnessing Science to Change the World" author Bill ___ |
| Nevada county in which part of Death Valley National Park is located |