Bill Nye

"The Science Guy"; Science Communicator, TV Presenter & Mechanical Engineer; Climate Change Activist

B.J. Novak

Actor, Writer & Comedian Known for "The Office"

Mayim Bialik

Neuroscientist, Mental Health Advocate & Actress Known for "The Big Bang Theory"

Seth Meyers

Host of "Late Night with Seth Meyers" & Former Head Writer for SNL

Tracee Ellis Ross

Actress, Producer; Chief Executive Officer at PATTERN

Max Greenfield

Actor Known For "New Girl" & Children's Author

Jon Stewart

Talk Show Host, Comedian & Producer

Earth (the Book): A Visitor's Guide to the Human Race. Written and Edited by Jon Stewar...

Jason Alexander

Actor, Writer & Director; Best Known for His Work on "Seinfeld"

Paul Reiser

Actor, Writer & Stand-Up Comedian Known for Portraying Paul Buchman in "Mad About You"

Henry Winkler

Actor, Producer, Director & Best-Selling Author; Best Known for "Happy Days"

Helen Hunt

Academy & Emmy Award-Winning Actress Known for Her Roles in "As Good as It Gets" and "Mad About You"

Chelsea Handler

Comedian, TV Personality & Author

Rashida Jones

Actor, Writer and Producer; Best Known for Roles in "The Office" & "Parks and Recreation"

Andy Samberg

Actor, Comedian, Rapper & Writer; Known for "Saturday Night Live" & "Brooklyn Nine-Nine"

Al Franken

Former Senator from Minnesota; Former SNL Writer; SiriusXM Radio Show Host

Paula Abdul

American Singer-Songwriter, Dancer, Choreographer & TV Personality

Judd Apatow

Director, Producer

Sarah Silverman

Stand-Up Comedian, Actress, Singer, Producer & Writer

Elizabeth Banks

Actress Best Known for "The Hunger Games" Series and "Pitch Perfect"

Simon Helberg

Actor & Comedian; Best Known for Role of Howard Wolowitz on "The Big Bang Theory"