
...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

that's just a doodle of
a hyperelliptic Riemann SURFACE.
The Big Bang Theory Season 7, Episode 20

...with silicone RTV
to provide a better mounting SURFACE?
The Big Bang Theory Season 2, Episode 18

If there is life beneath
the SURFACE of these planets,
The Big Bang Theory Season 11, Episode 10