A sigma PARTICLE.
The Big Bang Theory Season 1, Episode 13
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
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