
The wheel was a great idea.
Relativity was a great idea.
The Big Bang Theory Season 1, Episode 7

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

Just explaining the theory of RELATIVITY.
The Big Bang Theory Season 6, Episode 5

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

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