How to use it
Once a week, watch people in public where you can't hear them: feet, posture, the real vs polite smile. In conversation, notice the voice as much as the words. Use it to care for people, never to play them.
How sure we are
S Evidence: strong. Large trials or many studies, pointing the same way.
C Evidence: contested. The research disagrees. Named, so you can stop worrying about it.
Sources
Brief silent clips predict real outcomes surprisingly well (Ambady & Rosenthal 1992, meta-analysis) · micro-expression and "dead eyes" claims are weak (⚠️).
Not medical, legal or financial advice.