It's SUBATOMIC particles
in endless aimless collision.
Breaking Bad Season 3, Episode 10
I can't see SUBATOMIC particles,
but nevertheless, they're there.
The Big Bang Theory Season 4, Episode 3
Penny has no interest
in SUBATOMIC particle research.
The Big Bang Theory Season 3, Episode 15
...but the added fun of SUBATOMIC particles
and waves outside the visible spectrum.
The Big Bang Theory Season 8, Episode 19
What exactly are SUBATOMIC particles?
The Big Bang Theory Season 3, Episode 10