![She thought if I failed at theoretical physics
that I should have a trade to fall back on.
She thought if I failed at theoretical physics
that I should have a trade to fall back on.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
She thought if I failed at THEORETICAL physics
that I should have a trade to fall back on.
The Big Bang Theory Season 2, Episode 10
![Now to tell you about
the Theoretical Physics Department...
Now to tell you about
the Theoretical Physics Department...](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Now to tell you about
the Theoretical Physics Department...
The Big Bang Theory Season 2, Episode 6
![Not just for theoretical physics,
but for astrophysics.
Not just for theoretical physics,
but for astrophysics.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Not just for THEORETICAL physics,
but for astrophysics.
The Big Bang Theory Season 8, Episode 6
![Leonard, in the world
of theoretical physics, you never finish.
Leonard, in the world
of theoretical physics, you never finish.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Leonard, in the world
of THEORETICAL physics, you never finish.
The Big Bang Theory Season 10, Episode 15
![Senior theoretical particle physicist
at CaITech, focusing on M Theory.
Senior theoretical particle physicist
at CaITech, focusing on M Theory.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Senior THEORETICAL particle physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14