Hey, in your super-cooled
HELIUM experiments,
The Big Bang Theory Season 9, Episode 16
"Helium."
The Big Bang Theory Season 2, Episode 5
the abbreviation for HELIUM.
The Big Bang Theory Season 7, Episode 3
- Helium.
- Yes.
The Big Bang Theory Season 9, Episode 23
One time my brothers
made me breathe HELIUM.
The Big Bang Theory Season 12, Episode 6