I'm telling you,
if XENON emits ultraviolet light...
The Big Bang Theory Season 4, Episode 4
Anyway, Sheldon, we're at a decision point
to run the XENON stream
The Big Bang Theory Season 10, Episode 20
And XENON has a bigger nucleus,
The Big Bang Theory Season 11, Episode 8
Be even better if he swapped out
the helium for XENON.
The Big Bang Theory Season 11, Episode 8
Yes, well, if we lived in a world where
slow-moving XENON produced light...
The Big Bang Theory Season 4, Episode 4