"Eppur Si Muove" is the 104th episode of The West Wing, and sixteenth of its fifth season. It originally aired on NBC on March 3, 2004. Events center on a controversy relating to the National Institutes of Health, involving President Bartlet’s middle daughter Ellie. Written by Alexa Junge and directed by Llewellyn Wells, the episode contains guest appearances by Michael Gaston, Deirdre Lovejoy, and Cherry Jones, as well as the Muppet characters from Sesame Street.