- Is it a secret?
- No, it's a NITROGEN laser.
The Big Bang Theory Season 6, Episode 5
WALT:
Nitrogen bonds to oxygen,
which in turn...
Breaking Bad Season 2, Episode 7
Careful, Leonard. Liquid NITROGEN,
320 degrees below zero.
The Big Bang Theory Season 1, Episode 5
NITROGEN--
The Big Bang Theory Season 7, Episode 3