You see, instead of
using LIQUID helium...
The Big Bang Theory Season 11, Episode 8
my original theory that space time
was like a super-cooled LIQUID,
The Big Bang Theory Season 9, Episode 18
The world's most boring LIQUID
and the world's most boring vegetable,
The Big Bang Theory Season 10, Episode 13
Careful, Leonard. Liquid nitrogen,
320 degrees below zero.
The Big Bang Theory Season 1, Episode 5
I'm not seeing anyone
using LIQUID helium vortices like this.
The Big Bang Theory Season 9, Episode 16