She's a neurobiologist, and
I'm a THEORETICAL physicist.
The Big Bang Theory Season 7, Episode 21
...because he said
it was a THEORETICAL nut conflict.
The Big Bang Theory Season 8, Episode 21
Senior THEORETICAL particle physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14
I have to tell you that while I do have
a THEORETICAL understanding...
The Big Bang Theory Season 2, Episode 5
No, he's a THEORETICAL physicist
at CalTech.
The Big Bang Theory Season 9, Episode 8