A sigma PARTICLE.
The Big Bang Theory Season 1, Episode 13
Professor Rothman urinated in
the PARTICLE physics wab again,
The Big Bang Theory Season 5, Episode 14
Here, we have a highly gifted researcher
in the field of PARTICLE physics...
The Big Bang Theory Season 3, Episode 15
"Higgs boson PARTICLE."
How could you not get that?
The Big Bang Theory Season 3, Episode 13
Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15