Here, we have a highly gifted researcher
in the field of PARTICLE physics...
The Big Bang Theory Season 3, Episode 15
Here's where we derived the mass
of the dark-matter PARTICLE.
The Big Bang Theory Season 3, Episode 4
"Higgs boson PARTICLE."
How could you not get that?
The Big Bang Theory Season 3, Episode 13
All right, so
this PARTICLE here
The Big Bang Theory Season 5, Episode 21
Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15