Laughter is an instinctive behavior, produced and recognized by people of all cultures.

Most laughter is not about humor, it's about relationships between people. We are 30 more times likely to laugh in a social situation than when we are alone.

The speaker tends to laugh more than the audience.

In groups, women laugh more than men.

Laughter tends to occur in short bursts of vowel-like sounds such as "ha-ha," "ho-ho," or "he-he," which are repeated every fifth of a second.

Most people can't laugh on command. Laughter is not something we produce consciously.

We really only laugh during the pauses we make for coughing or breathing.