Rule 1: When interacting with a human, make sure to use proper facial expressions. A smile is a must. A frown is a definite no-go.
Rule 2: When speaking, use a volume that is not ear-bleachingly loud. You may be in a library, but that's no excuse for being a social outcast.
Rule 3: When eating at a table, don't lick your fingers. You're not a dog. You're a human being with a tablecloth and a reputation to uphold.
Continue reading: Social Cues