Alison Bartlett O'Reilly

Norah Jones sings about the letter 'Y' with Elmo.

Telly Monster and Baby Bear are reporting on Sesame Street’s Fairy Tale Science Fair, where fairy tale characters solve their problems using science. Also in this episode: Samantha Harris and Elmo explain the word “reporter,” and Ernie sings his Daytime Emmy-nominated song, “I Wonder.” Brought to you by the letter W and the number 18.

After Big Bird’s dust bath, it seems that Snuffy is allergic to his best friend! Will Snuffy and Big Bird ever be able to play together again? Also in this episode: Taye Diggs and Idina Menzel try to explain the word “allergic,” but their animal assistants keep making them sneeze. Brought to you by the letter K and the number 10.

Rosita, Telly, and Elmo are waiting for the Itsy Bitsy Spider to climb up the water spout, but the spider is missing! Can the friends track down their arachnid among all the insects in the garden? Also in this episode: The Big Bang Theory’s Jim Parsons explains the word “arachnid.” Brought to you by the letter N and the number 8.