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
...of a subatomic PARTICLE
called the Higgs boson.
The Big Bang Theory Season 6, Episode 3
Professor Rothman urinated in
the PARTICLE physics wab again,
The Big Bang Theory Season 5, Episode 14
You'd be surprised how many
PARTICLE physicists have a whimsical side.
The Big Bang Theory Season 2, Episode 13