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

in the Earth's
SURFACE.
The Big Bang Theory Season 7, Episode 3

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

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

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