A sigma PARTICLE.
The Big Bang Theory Season 1, Episode 13
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
Senior theoretical PARTICLE physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14
You'd be surprised how many
PARTICLE physicists have a whimsical side.
The Big Bang Theory Season 2, Episode 13