...as the SURFACE of
an n-dimensional superfluid.
The Big Bang Theory Season 8, Episode 23
in the Earth's
SURFACE.
The Big Bang Theory Season 7, Episode 3
If there is life beneath
the SURFACE of these planets,
The Big Bang Theory Season 11, Episode 10
or under the icy SURFACE
of Europa?
The Big Bang Theory Season 11, Episode 10
Can you recommend a SURFACE
The Big Bang Theory Season 7, Episode 18