7.82 avg 10 episodes 7.9 → 7.4 41 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | George Takei | 7.9 | 52 |
| 2 | Christopher Nolan | 8.0 | 50 |
| 3 | Dan Savage | 7.4 | 37 |
| 4 | Arianna Huffington | 7.5 | 27 |
| 5 | Richard Dawkins | 8.5 | 39 |
| 6 | Jimmy Carter | 8.3 | 32 |
| 7 | Chris Hadfield | 7.9 | 30 |
| 8 | Biz Stone | 7.4 | 29 |
| 9 | Charles Bolden | 7.9 | 27 |
| 10 | Norman Lear | 7.4 | 27 |
7.60 avg 10 episodes 7.4 → 7.8 41 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Bill Clinton | 7.4 | 29 |
| 2 | Larry Wilmore | 7.4 | 22 |
| 3 | Seth MacFarlane | 7.5 | 29 |
| 4 | Penn and Teller | 7.2 | 25 |
| 5 | Susan Sarandon | 7.5 | 21 |
| 6 | David Byrne | 7.5 | 20 |
| 7 | Mars 1 | 7.9 | 19 |
| 8 | David Crosby | 7.7 | 19 |
| 9 | Brian Cox | 8.1 | 21 |
| 10 | Gina McCarthy | 7.8 | 22 |
7.48 avg 20 episodes 7.5 → 7.3 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Whoopi Goldberg | 7.5 | 24 |
| 2 | Mayim Bialik | 7.9 | 21 |
| 3 | Man on Wire | 7.5 | 18 |
| 4 | Time Travel | 7.9 | 20 |
| 5 | Theoretical Physics | 7.8 | 22 |
| 6 | Robert Kirkman and the Walking Dead | 7.1 | 20 |
| 7 | Jeremy Irons | 7.3 | 18 |
| 8 | The Martian | 8.3 | 21 |
| 9 | Ben Stiller | 7.0 | 17 |
| 10 | Buzz Aldrin | 7.6 | 18 |
| 11 | Terry Crews | 7.3 | 16 |
| 12 | Jay Leno | 7.4 | 15 |
| 13 | William Shatner | 7.4 | 20 |
| 14 | US Secretary of Defense Ash Carter | 6.6 | 17 |
| 15 | Hope Solo | 7.2 | 15 |
| 16 | Search for Aliens | 8.1 | 17 |
| 17 | The Science of Weather | 7.6 | 18 |
| 18 | Science of Game of Thrones | 6.9 | 18 |
| 19 | Herbie Hancock and Wayne Shorter | 7.8 | 16 |
| 20 | Bill Maher | 7.3 | 17 |
7.93 avg 20 episodes 7.8 → 9.3 47 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Lance Armstrong | 7.8 | 21 |
| 2 | Kareem Abdul-Jabbar | 7.8 | 17 |
| 3 | Jane Goodall | 8.5 | 21 |
| 4 | Katie Couric | 7.8 | 16 |
| 5 | Kevin Smith | 7.5 | 17 |
| 6 | SciFi Meets National Defense | 7.4 | 17 |
| 7 | Katy Perry | 7.0 | 21 |
| 8 | Sylvia Earle, Fabien Cousteau & Adrian Grenier | 7.7 | 17 |
| 9 | James Cameron | 7.9 | 24 |
| 10 | Celestial Navigation | 7.8 | 16 |
| 11 | Salman Rushdie | 7.9 | 13 |
| 12 | Interstellar Space Travel | 8.2 | 15 |
| 13 | Alan Alda | 8.3 | 13 |
| 14 | Stephen Colbert | 7.2 | 20 |
| 15 | True Story of Hidden Figures | 8.1 | 12 |
| 16 | Sam Harris and the Science of Belief | 8.1 | 13 |
| 17 | Frank Oz and the Science of Puppeteering | 8.1 | 13 |
| 18 | Kelly Slater and the Science of Surfing | 7.9 | 11 |
| 19 | Astronaut Scott Kelly | 8.3 | 10 |
| 20 | Stephen Hawking | 9.3 | 31 |
8.14 avg 16 episodes 8.5 → 7.4 47 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Anthony Bourdain | 8.5 | 26 |
| 2 | Joe Rogan and the Science of Primitive Man | 8.3 | 18 |
| 3 | The Big Bang Theory's Simon Helberg & Bill Prady | 8.6 | 17 |
| 4 | US Space Command | 8.5 | 16 |
| 5 | Vice President Al Gore | 7.5 | 13 |
| 6 | Actor Jack Black | 8.6 | 17 |
| 7 | News Anchor Dan Rather | 8.7 | 19 |
| 8 | Author George R.R. Martin | 8.8 | 18 |
| 9 | Actress Anna Deavere Smith | 7.4 | 9 |
| 10 | Actor Jeff Goldblum | 8.5 | 17 |
| 11 | Actor James Marsden | 7.6 | 13 |
| 12 | Weird Al Yankovic | 7.6 | 15 |
| 13 | Author Patricia Cornwell | 8.6 | 9 |
| 14 | Director Darren Aronofsky | 7.3 | 9 |
| 15 | Bill Nye | 8.4 | 9 |
| 16 | Journalist Christiane Amanpour | 7.4 | 7 |
