Leonard, Howard says you're working on
FUNDAMENTAL tests...
The Big Bang Theory Season 3, Episode 10
of the FUNDAMENTAL nature
of symmetry.
The Big Bang Theory Season 12, Episode 9
SHELDON: [stammers]
The FUNDAMENTAL problem
The Big Bang Theory Season 12, Episode 5
that the FUNDAMENTAL particles
we see in three dimensions
The Big Bang Theory Season 11, Episode 13
Fundamental in this whole war!
Money Heist Season 3, Episode 7