Leonard, in the world
of THEORETICAL physics, you never finish.
The Big Bang Theory Season 10, Episode 15
You're summa cum laude in THEORETICAL
physics from Stanford University.
The Big Bang Theory Season 6, Episode 3
I have to tell you that while I do have
a THEORETICAL understanding...
The Big Bang Theory Season 2, Episode 5
as a THEORETICAL
physicist,
The Big Bang Theory Season 7, Episode 20
It's very impressive.
For THEORETICAL work.
The Big Bang Theory Season 4, Episode 3