We never have to learn how to do it. We're

herited. We never have to learn how to do it. We're
born with the knowledge.
The greeting with the eyes, the flirting glance, is
another matter. Irenaus Eibl-Eibesfeldt, a German behavioral
scientist, used cameras and mirrorlike attachments
that permitted him to film people all over the
world without their knowledge. With each picture, he
wrote down the social context in which the filmed incident
occurred.
Comparing his films, he found that among the most
different people in the world, Balinese, Papuans, French,
and Waika Indians, a rapid raising and lowering of the
eyebrows accompanied by a smile and often a nod was
used as a friendly flirting gesture—the same sort of gesture
you describe. It worked for you in the States and in
France, too. Eibl-Eibesfeldt found that it works all over
the world.
He likens this flirting glance to one of the gestures
passed down from "an ancient evolutionary inheritance."
Other inherited gestures, according to this German behaviorist,
are rotating our arms inward and raising our
shoulders when we're threatened, pulling the corners of
our mouths down when we're angry, exposing upper
canine teeth which are no longer large enough to be
dangerous when we're annoyed, and, in women, lowering
the eyelids and head as they look away. This, he feels is
a evolutionary remnant of the animal's flight reaction.
These findings of hereditary signals in our body language
lexicon contradict the idea that only the smile is