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

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

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

Can you recommend a SURFACE
The Big Bang Theory Season 7, Episode 18

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