Eighteen parts per million.
The Big Bang Theory Season 8, Episode 9
--EIGHTEEN, 19 and 20.
Breaking Bad Season 5, Episode 11
If you would just let me.
Eighteen months.
Breaking Bad Season 2, Episode 12
Eighteen years ago,
I sent the FBI Crime Lab samples...
The Big Bang Theory Season 4, Episode 7
Eighteen kilometers per hour.
Money Heist Season 3, Episode 8