No-one has come up with a definitive reason for WHY some people are left-handed, but about 13% of the population around the world are, and it is thought to be genetic – it definitely runs in families. Researchers have recently located a gene they believe “makes it possible to have a left-handed child ” so if you have that gene, one or more of your children may be left-handed, whereas without it, you will only have right-handers – sorry! The good news is, that if you are left-handed yourself, you have that gene and will pass it on through the generations!
The way the brain works is incredibly complex, but this simplified explanation will give you some understanding of where our left-hand dominance comes from. The brain is “cross-wired” so that the left hemisphere controls the right handed side of the body and vice-versa and hand dominance is connected with brain dominance on the opposite side – which is why we say that only left-handers are in their right minds!