
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