In Hong Kong, when taking a walk, you might encounter foreigners who are always ready to smile friendly and wave at you; I once took a cable car, and a foreign couple got on and greeted everyone.

When foreigners meet, even between opposite sexes, they often give enthusiastic hugs and cheek kisses, doing it openly and naturally.

In China, if a girl just looks at a boy a little longer, the boy will go home and think about it all night: Does she like me?

Interesting cultural differences.