
Then a laser will map
the reflective SURFACE...
The Big Bang Theory Season 6, Episode 5

...as the SURFACE of
an n-dimensional superfluid.
The Big Bang Theory Season 8, Episode 23

or under the icy SURFACE
of Europa?
The Big Bang Theory Season 11, Episode 10

...given the SURFACE area of this car
is about 60,000 square centimeters...
The Big Bang Theory Season 8, Episode 19

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