...as the SURFACE of
an n-dimensional superfluid.
The Big Bang Theory Season 8, Episode 23
what do you say we get back
to SURFACE tension of domain walls?
The Big Bang Theory Season 9, Episode 10
...on a SURFACE located
at the farthest reaches of our cosmos.
The Big Bang Theory Season 6, Episode 5
Can you recommend a SURFACE
The Big Bang Theory Season 7, Episode 18
or under the icy SURFACE
of Europa?
The Big Bang Theory Season 11, Episode 10