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
All right, so
this PARTICLE here
The Big Bang Theory Season 5, Episode 21
each vibration is
a different 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