Your Day in Pop Culture (Monday, Aug. 18, 2014)

This Day in Pop Culture History
1868: Helium is discovered. "You're welcome," said the man who found it in a very high, squeaky voice.

Famous People Have Birthdays Too
1936: Robert Redford, actor (Ordinary People, The Candidate, The Great Gatsby, Three Day of the Condor, All the President's Men, All Is Lost, Captain America: The Winter Soldier)
1957: Denis Leary, actor (Rescue Me, The Amazing Spider-Man series, Ice Age series)
1969: Christian Slater, actor (The Legend of Billie Jean, Heathers)
1978: Andy Samberg, actor (Saturday Night Live, Hot Rod, Brooklyn Nine-Nine)

Who's on What Tonight: Your Guide to Late-Night TV
CONAN: Musician Josh Groban, Nathan For You's Nathan Fielder, musician Jenny Lewis
FALLON: Comedy legend Bill Cosby, philanderer Tiger Woods, golfer Rory McIlroy, Royksopp and Robyn
LETTERMAN: Sin City: A Dame to Kill For's Bruce Willis, music group The Gaslight Anthem)
KIMMEL: REPEAT
MEYERS: REPEAT
FERGUSON: REPEAT