Who Are Left Handers?

In human biology, handedness is an individual's preferential use of one hand, known as the dominant hand, due to it being stronger, faster or better in dexterity. The other hand, comparatively often the weaker, less dextrous or simply less subjectively preferred, is called the non-dominant hand.

What causes a person to be left-handed?

Fetal development – some researchers believe that handedness has more of an environmental influence than genetic. ... Brain damage – a small percentage of researchers theorise that all human beings are meant to be right-handed, but some type of brain damage early in life causes left-handedness.

Why is it so rare to be left-handed?

As handedness is a highly heritable trait associated with various medical conditions, and because many of these conditions could have presented a Darwinian fitness challenge in ancestral populations, this indicates left-handedness may have previously been rarer than it currently is, due to natural selection.