In this episode, Horizon explores the characteristics of left-handed people.
Handedness is a human attribute defined by unequal distribution of fine motor skills between the left and right hands. An individual who is more able with the right hand is called right-handed or a (informally) righty and one who is more skilled with the left is said to be left-handed or a lefty. The majority of infants develop hand preference by 6 months of age. A minority of adult people are equally skilled with both hands, and are termed ambidextrous. Handedness is one example of body laterality.