Carbon.
The Big Bang Theory Season 12, Episode 23
Needed bigger CARBON atoms.
The Big Bang Theory Season 3, Episode 14
I don't know. How do CARBON atoms
form a benzene ring?
The Big Bang Theory Season 2, Episode 13
refine it into CARBON dust,
The Big Bang Theory Season 7, Episode 7
Unit cell contains two CARBON atoms.
The Big Bang Theory Season 3, Episode 14