- Helium.
- Yes.
The Big Bang Theory Season 9, Episode 23
I'm not seeing anyone
using liquid HELIUM vortices like this.
The Big Bang Theory Season 9, Episode 16
Be even better if he swapped out
the HELIUM for xenon.
The Big Bang Theory Season 11, Episode 8
Hey, in your super-cooled
HELIUM experiments,
The Big Bang Theory Season 9, Episode 16
the abbreviation for HELIUM.
The Big Bang Theory Season 7, Episode 3