|Sid the Science Kid|
|"What's That Smell?"|
|Air Date||September 23, 2008|
|Written by||Joe Purdy|
|Directed by||Brian Henson|
|Previous Episode||The Itchy Tag|
|Next episode||Grandma's Glasses|
"What's That Smell?" is the twelveth episode of the television series Sid the Science Kid.
Sid wakes up to his favorite smell in the world, pancakes. But the yummy scent is quickly taken over by a different smell when baby brother Zeke and his stinky diaper enter Sid's room. At school, Sid learns how smells travel through the air and arrive inside the nose.