...not only about what one says, but about
FACIAL expressions, autonomic reflexes.
The Big Bang Theory Season 2, Episode 1
I don't particularly excel
at reading FACIAL expressions...
The Big Bang Theory Season 2, Episode 21
...and did so
using a stern FACIAL expression.
The Big Bang Theory Season 4, Episode 24
I could deduce by his FACIAL expression
and body language that he was sad.
The Big Bang Theory Season 10, Episode 16
It requires 34 FACIAL muscles
and 112 postural muscles.
The Big Bang Theory Season 4, Episode 21