
Loop quantum GRAVITY
is the future of physics.
The Big Bang Theory Season 2, Episode 2

...for this university's
six-loop quantum GRAVITY calculations.
The Big Bang Theory Season 6, Episode 9

Besides disrupting the local GRAVITY field.
The Big Bang Theory Season 1, Episode 6

I really miss GRAVITY.
The Big Bang Theory Season 6, Episode 3

It uses powerful electromagnets to create
a force strong enough to overcome GRAVITY.
The Big Bang Theory Season 6, Episode 5