"The Recollection Dissipation"[1] is the twentieth episode of the tenth season of the American sitcom The Big Bang Theory. The episode aired on April 6, 2017.


Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day. Also, Bernadette is nearing the end of her maternity leave and must return to work, but she seems reluctant to do so.



  • Title Reference: Sheldon has memory problems.
  • Taping date: March 14, 2017
  • This episode was watched by 12.59 million people with a rating of 2.7 (adults 18-49).
  • Total viewers including DVR users 17.11 million.
  • The Big Bang Theory was ranked #x for the week ending xx April 2017.
  • This episode aired in Canada on April 6, 2017.
  • Chuck Lorre's vanity card [1].


  • Caroline Preece at Den of Geek! - The Recollection Dissipation sees Sheldon pulling a Mrs Doubtfire on Amy and Leonard, but the twist is that everyone knows about it and it’s not remotely funny...I still enjoy whenever Bernadette gets to wrestle with motherhood yet still be a real character, and the exchange between Penny and Sheldon in the laundry room is the kind of sweet and familiar scene the show used to do so well. I also laughed at the gag about Sheldon having to be a tutor to much larger men should he go to prison...And Stuart also gets to be a person here, with Bernadette confiding in him her worries about going back to work now that her maternity leave is over. It’s a welcome glimpse of what Stuart’s role in the household...But Amy is otherwise engaged, as we see from the final scene. I’m just going to go ahead and assume that Mayim Bialik can genuinely sing Soft Kitty in German and Mandarin, because she’s just that awesome. [2]
  • IMDb user reviews


  • In this episode, Sheldon cannot seem to recall some of the past events in his life, which is normally out of character for him due to his eidetic memory.
  • Howard kept a secret from Bernadette involving the death of her aunt Trixie for six years.
  • Soft Kitty returns in this episode after its last occurrence in "The Anxiety Optimization". This time, it's sung by Amy in three different languages. In a sheer coincidence, a little over before this episode's airing, The Big Bang Theory staff won the lawsuit regarding the copyright issues over Soft Kitty.
  • Penny is now more aware of Sheldon's habit of saying facts about something she may bring up.
  • The daycare that looks after Halley banned Stuart from the premises.
  • Sheldon unintentionally spills information about the secret quantum gyroscope he, Leonard, and Howard have been working on.


Amy: [talking about Sheldon] How could he not remember a day?
Penny: Well, people who are abducted by aliens lose time. I mean, maybe it happens to the aliens, too.

[first lines]

Penny: Hey Leonard, if you're not busy tomorrow, I have to do a little reception at work.
Leonard: Oh, I would, but we need to make a push on the air force project.
Penny: Are you sure? We're celebrating our new ADD drug. I mean it'll probably be over in like six minutes
Amy: Did you say you guys are working on the guidance system tomorrow?
Leonard: Yeah, why?
Amy: Well, Sheldon said that he was going to work with me on our quantum perception project.
Leonard: We've had this planned for a week.
Amy: Well, he reconfirmed with me this morning.
Raj: Guys, before this gets ugly, remember - the winner gets Sheldon.

Amy: Why did you tell Leonard you're working on the gyroscope tomorrow?
Sheldon: Because I am.
Amy: But you said you were working for me.
Penny: Uh-oh! Somebody's got two dates to the nerd prom.
Sheldon: I have a plan to work on both projects simultaneously. [to Penny]
Sheldon: And for your information, the summer conference on algebraic topology at Caltech is nerd prom.



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