And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13
Unless you have Gravity
on Blu-ray under that skirt,
The Big Bang Theory Season 7, Episode 21
What about loop quantum GRAVITY?
The Big Bang Theory Season 7, Episode 20
...for this university's
six-loop quantum GRAVITY calculations.
The Big Bang Theory Season 6, Episode 9
Loop quantum GRAVITY
is the future of physics.
The Big Bang Theory Season 2, Episode 2