But Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15
inventing a new
dark matter PARTICLE
The Big Bang Theory Season 11, Episode 13
All right, so
this PARTICLE here
The Big Bang Theory Season 5, Episode 21
"Higgs boson PARTICLE."
How could you not get that?
The Big Bang Theory Season 3, Episode 13
...of a subatomic PARTICLE
called the Higgs boson.
The Big Bang Theory Season 6, Episode 3