
...of the equations of general RELATIVITY
and hydrodynamics...
The Big Bang Theory Season 6, Episode 24

about RELATIVITY,
was always rooted in twins.
Westworld Season 3, Episode 8

...with general RELATIVITY
than does string theory.
The Big Bang Theory Season 2, Episode 2

When Einstein came up
with special RELATIVITY...
The Big Bang Theory Season 3, Episode 14

Einstein's RELATIVITY equations
pop out.
The Big Bang Theory Season 11, Episode 13