Here's where we derived the mass
of the dark-matter PARTICLE.
The Big Bang Theory Season 3, Episode 4
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
each vibration is
a different PARTICLE.
The Big Bang Theory Season 11, Episode 13
But Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15