You're getting warmer--
it is, indeed, in the BRAIN.
The Big Bang Theory Season 5, Episode 16
You need to push your BRAIN out of its
comfort zone and reach mental exhaustion.
The Big Bang Theory Season 10, Episode 22
If you were a BRAIN scientist,
you would be busting a gut right now.
The Big Bang Theory Season 6, Episode 3
Brain lesions!
The Big Bang Theory Season 7, Episode 12
But short of putting electrodes in your BRAIN
and monitoring your response...
The Big Bang Theory Season 2, Episode 13