What makes people laugh? How well do jokes travel across borders and generations? Read a selection of jokes from "Guardian" readers across the globe.

Bill Gee has turned aerobic laughter into a science, offering dedicated wellbeing programmes at his Happiness University in Woodstock, Cape Town.

The truth is, the phenomenon is not the mystical and magical art many assume it is.

Stressed caregivers find that it boosts their spirits and rubs off on their patients, writes <b>Sibongile Nkosi</b>.