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

And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13

I got to experience
zero GRAVITY.
The Big Bang Theory Season 5, Episode 18

The idea that you might be able
to incorporate GRAVITY...
The Big Bang Theory Season 2, Episode 6

No, there isn't. Only loop quantum GRAVITY
calculates the entropy of black holes.
The Big Bang Theory Season 2, Episode 2