Penny has no interest
in subatomic PARTICLE research.
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
Here, we have a highly gifted researcher
in the field of PARTICLE physics...
The Big Bang Theory Season 3, Episode 15
of the Higgs boson PARTICLE,
and you said,
The Big Bang Theory Season 5, Episode 21
You'd be surprised how many
PARTICLE physicists have a whimsical side.
The Big Bang Theory Season 2, Episode 13