Hang on, let's talk about it. This is a
National Science Foundation expedition.
The Big Bang Theory Season 2, Episode 23
l know you're a Chilean NATIONAL,
Breaking Bad Season 4, Episode 8
at the National Accelerator..."
[inhales]
The Big Bang Theory Season 12, Episode 9
The National Science Foundation
The Big Bang Theory Season 7, Episode 6
by the number of colors
in the oldest NATIONAL flag still in use--
The Big Bang Theory Season 9, Episode 8