
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

each vibration is
a different PARTICLE.
The Big Bang Theory Season 11, Episode 13

...of a subatomic PARTICLE
called the Higgs boson.
The Big Bang Theory Season 6, Episode 3

All right, so
this PARTICLE here
The Big Bang Theory Season 5, Episode 21