Penny: Hey, let's light a fire.
Amy: Ooh, that sounds cozy.
Leonard: I don't think I've lit a real fire before.
Sheldon: Ah, it's basic thermodynamics. I'm sure we can figure that out.
Leonard: I could stack the logs conically to facilitate airflow.
Sheldon: That would maximize oxygen for optimal combustion.
Leonard: Right. So all we need is to...
Penny: Got it.
Leonard: A scientist made that.