
I mean, they're highly-trained educators
with BACKGROUND checks.
The Big Bang Theory Season 10, Episode 21

What's your educational BACKGROUND?
The Big Bang Theory Season 6, Episode 2

cosmic BACKGROUND radiation
from the singularity.
The Big Bang Theory Season 12, Episode 13

We'd have
the same cultural BACKGROUND...
The Big Bang Theory Season 1, Episode 2

They shot me in front of a starry
BACKGROUND where I posed like this:
The Big Bang Theory Season 2, Episode 4