
...freeing my prefrontal cortex
to work quietly in the BACKGROUND.
The Big Bang Theory Season 3, Episode 14

to do a BACKGROUND
check on her.
The Big Bang Theory Season 12, Episode 4

Well, I did a comprehensive
BACKGROUND check.
The Big Bang Theory Season 6, Episode 3

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