Previously on
The Big Bang Theory...
The Big Bang Theory Season 12, Episode 21
It's the closest we've come
to a THEORY of everything,
The Big Bang Theory Season 11, Episode 13
I hope you know, with these
new data supporting your THEORY,
The Big Bang Theory Season 12, Episode 13
elasticity THEORY
and model the lattice
The Big Bang Theory Season 11, Episode 13