|Plot||The Happy Scientists|
|Air date||September 28, 2010|
|Season||Season 41 (2010)|
| ||What's the Word on the Street?: Journal|
| ||Elmo, Telly and Rosita are playing tag, when they knock over some papers from Gordon's science class. Inspired, they all decide to be scientists. They don lab coats and sing a jaunty, science tune. Gordon explains the steps to be a scientists; First, they need to make a question they want an answer to. They look around the street for inspiration and spot Leela giving Barkley a bath. They wonder if everyone on Sesame Street takes a bath. Elmo and Rosita form a hypothesis that everyone does, while Telly thinks everyone doesn't. Armed with a journal to take notes, they head off to find some data.|
| ||Chris sits in his bathtub, singing a song, when the Happy Scientists appear. Much to his embarrassment, they observe that he takes a bath and Telly draws a picture for their journal. They sing their song again and disappear. Chris makes a note to put a lock on the door.|
| ||The Happy Scientists find a cat licking himself. To Telly's surprise, they discover this is how a cat takes a bath. They add it to their journal and go looking for more residents.|
| ||In the garden, they watch a sparrow roll in the dirt. Telly is sure that the bird isn't bathing and believes his hypothesis is correct, when the sparrow explains that he's taking a dust bath to keep his feathers and skin healthy. Telly doesn't believe it and finds an owl, who isn't taking a dust bath like the sparrow. The owl is actually taking a sun bath, to get rid of germs in her feathers. Losing hope, Telly thinks of someone who he's sure doesn't take a bath.|
| ||Telly bangs on Oscar's trash can, sure he won't be taking a bath. But, Oscar emerges while taking a mud bath. Telly is upset and exclaims he's a "mad scientist." Gordon finds him yelling and explains that it's okay to be wrong in science; the important thing is the data they found. They show him their journal and conclude that everyone on Sesame Street takes a bath. The Happy Scientists sing their song once more.|
| ||Wanda Sykes explains what a journal is. She shows Elmo her own journal, who starts to reveal her private entries himself.|
| || Murray announces that Abby's Flying Fairy School is coming up, but first, he and some New York citizens play "Bring Out Your F", displaying F words they have on them.|
(First: Episode 4189)
| ||From the International Space Station, JAXA astronaut Soichi Noguchi shows the letter F stands for "float."|
| || Murray and Jake introduce Abby's Flying Fairy School.|
(First: Episode 4190)
| || Abby's Flying Fairy School|
Abby, Gonnigan and Blögg put their items in their cubbies, when they suddenly vanish, along with Mrs. Sparklenose's wand. They see a Cubby Creature inside, but can't catch him. They call on Spot, who shows them some patterns. They see the creature pops out of each colored cubby in a pattern and follow it to get into his lair. Once their, they find they have to guess his name to win their stuff back. They play "The Name Game", asking for clues as to what his name is. They get it right and the Cubby Creature has such a fun time, he reforms his ways and gives everything back.
In the HBO version, this is replaced with the "Opposite Day" episode.
| ||Will.i.am and friends sing "What I Am."|
| || Murray announces Bert and Ernie's Great Adventures is coming up, but first, he and various kids count to 14.|
(First: Episode 4197)
| ||Chris (in voice-over) says the Two-Headed Monster will show 14. One half shows 7 pigs, while the other has 7 chickens, neither of which are 14. But when added together, they make 14!|
| || Murray and a large group of kids introduce Bert and Ernie's Great Adventures.|
(First: Episode 4195)
| || Bert and Ernie's Great Adventures|
Ernie, Bert and Rubber Duckie are "The Three Ducketeers." They find King Louie Louie locked out of his castle; his queen, Marie-Marie, is mad at him for eating all of her birthday cake. He has brought a new one, but can't inside to apologize. Ernie hatches a plan to bring her the cake: They set up a pulley system with Bert getting hoisted up to her window with the cake. However, she snips the rope and he falls into the moat. Next, the pair gets on some stilts, but Marie-Marie unleashes the Royal Woodpecker on them. Then, Ernie sets Bert into a catapult to fire him toward her window, but she shuts it just as he reaches it. Rubber Duckie gives Ernie an idea to make up an apology song for her. She hears it, lets him inside and they all enjoy her cake.
| || Murray announces "Elmo's World" is coming up, but first, he gives a demonstration of forward and backward, walking forward and knocking the camera over.|
(First: Episode 4182)
| || A girl attends her yoga class.|
Director: Alan Muraoka
(First: Episode 4180)
| || Murray and Rachael introduce "Elmo's World."|
(First: Episode 4189)
| || Elmo's World: Bath Time|
(First: Episode 4058)
In the HBO version, this is replaced with "Dogs."
| ||Murray forgets what the sponsors are and a large TV screen displays them for him.|
- This episode is incorrectly numbered as #4217 in the official press kit.
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|Episode 4213||Episode 4215|