Adult Sheldon: The next day I returned to my role as lab assistant with renewed vigor. Bolts were greased, wires were stripped, floors were swept, all with a smile. It was a forced smile but you'd never know.
Dr. Linkletter: I must say, Sheldon, I'm impressed.
Sheldon: I gave you my word and I'm standing by it.
Dr. Linkletter: Well, I know it's not glamorous, but all scientists pay their dues.
Sheldon: And I'm happy to do it.
Dr. Linkletter: Good man.
Sheldon: I understand my role here. In fact, I noticed a flaw in your reaction rates, but I kept it to myself because I know my place.
Dr. Linkletter: You really think there's a flaw?
Sheldon: Oh, yes.
Dr. Linkletter: What is it?
Sheldon: I appreciate you testing me, but I'm not going to crack.
Dr. Linkletter: I'm not testing you.
Sheldon: Nice try.

Mary: Let's say grace.
Sheldon: Hang on, safety first. [puts mittens on]
George Jr.: When are you gonna get over that?
Sheldon: I would think recent events would make you value protection.
Mary: Enough.

Ms. MacElroy: Now, can anyone tell me why Melville shifts the narrative voice from Ishmael to Ahab? [Ms. MacElroy waits for somebody else to raise their hand] Sheldon.
Sheldon: I have a tummyache. I'd like to see the nurse.
Derek: A "tummyache"?
Sheldon: Yes, Derek, I have a tummy and it aches. Ergo, tummyache.
Derek: Ergo?
Sheldon: It's Latin, Derek.
Ms. MacElroy: Go to the nurse.
Sheldon: And to answer your question, the shifting point of view grants the reader a broader perspective of events than typically allowed by first-person narration.
Ms. MacElroy: Where were we?
Sheldon: And "ergo" is Latin for "hence," Derek.

Missy: What's it like to not believe in God?
Sheldon: It's great. Big fan.
Missy: Are you ever afraid you're wrong?
Sheldon: About religion? Never. About other things? Also never.

George Jr.: What is this?
Meemaw: That's the exercise guy Meemaw likes.
George Jr.: I can't believe anyone pays money to watch old people sweat.
Missy: 40 bucks?
George Jr.: They sold over a million of those? At 40 bucks a pop? Do you know how much money that must be?
Missy: I'm not a calculator.
[later:]
George Jr.: 40 times... one million. That's 40 million!
Missy: Whoa.

Adult Sheldon: Behind every great scientist, there were often unsung helpers toiling away in the background. Presenting... "Great Lab Assistants in Scientific History" When Alexander Graham Bell needed an assistant, it was Thomas Augustus Watson who answered the call. [laughs] Get it? "The call". [snickers] Madame Curie's daughter Irène was also her lab assistant. Irène was so dedicated, she died of radiation poisoning. Unlike her sister Ève, who selfishly lived to 102. Lastly, Émile Roux was assistant to Louis Pasteur. When they worked on the rabies vaccine, Roux kept a loaded gun in the lab to shoot Pasteur in the head if he got infected. He never had to, but it's fun to know he would have.
Dr. Linkletter: No, Sheldon. You can't be my lab assistant.
Sheldon: Maybe you weren't paying attention. I'll start over. Behind every great scientist, there was a dedicated as...

Adult Sheldon: While not the lab work I hoped to be doing, it did feel good to be part of an actual experiment. A tedious, menial part that could be performed by a monkey. Or worse, an engineer.