Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15
All right, so
this PARTICLE here
The Big Bang Theory Season 5, Episode 21
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
Here, we have a highly gifted researcher
in the field of PARTICLE physics...
The Big Bang Theory Season 3, Episode 15