...but that's the natural REACTION
of the limbic system...
The Big Bang Theory Season 3, Episode 11
...the success or failure of the date would
be based on the biochemical REACTION...
The Big Bang Theory Season 1, Episode 3
in which I looked up
the REACTION rates
The Big Bang Theory Season 7, Episode 6
My friend
is having allergic REACTION to peanuts.
The Big Bang Theory Season 1, Episode 16