
and you've been working
on string THEORY
The Big Bang Theory Season 7, Episode 20

Unified field THEORY,
cold fusion, the dogapus.
The Big Bang Theory Season 4, Episode 2

confirmed your THEORY.
The Big Bang Theory Season 12, Episode 13

Currently, you're being paid under a grant
to specifically research string THEORY.
The Big Bang Theory Season 8, Episode 2

Previously on
The Big Bang Theory...
The Big Bang Theory Season 7, Episode 10