- I wonder what he's doing this very second.
- Conducting experiments in zero GRAVITY.
The Big Bang Theory Season 6, Episode 1
I got to experience
zero GRAVITY.
The Big Bang Theory Season 5, Episode 18
And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13
I really miss GRAVITY.
The Big Bang Theory Season 6, Episode 3
The idea that you might be able
to incorporate GRAVITY...
The Big Bang Theory Season 2, Episode 6