It's called
scientific CURIOSITY!
The Big Bang Theory Season 5, Episode 17
Just out of CURIOSITY, what time
do you usually go to bed?
The Big Bang Theory Season 5, Episode 3
It's got my bottomless
intellectual CURIOSITY
The Big Bang Theory Season 12, Episode 9
Just out of CURIOSITY, how did
you come to be on the show?
The Big Bang Theory Season 11, Episode 15
Just, uh, out of CURIOSITY,
did he ever have a shot with you?
The Big Bang Theory Season 2, Episode 8