
Hang on, let's talk about it. This is a
National Science Foundation expedition.
The Big Bang Theory Season 2, Episode 23

at the National Accelerator..."
[inhales]
The Big Bang Theory Season 12, Episode 9

by the number of colors
in the oldest NATIONAL flag still in use--
The Big Bang Theory Season 9, Episode 8

like dancing hippies
at the Redwood National Forest.
The Big Bang Theory Season 5, Episode 2

Remember the grant proposal I submitted
to the National Science Foundation...
The Big Bang Theory Season 2, Episode 23