Why are some people left handed?

You must have seen people who eat, right or
playing tennis with their left hand. But  more

people on the earth are right handed. Less
than one person in 6 is left handed.

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Our  brain is a complicated organ. The right half
of the brain controls the left side of the body,
and the left side controls the right side of the body.
In  most people, the left side of the brain is better

developed , so the right hand is more efficient
and stronger than the left one.

   No one knows for sure why it happens, but
sometimes in some people the  right side of

the brain is better developed. and this makes
their left hand work better.

     According  to some experts, it is possible that
person goes back to ancient days or

even the days of caveman. When  people fought,
are right handed person would fight

with a weapon in his right hand and use his left
hand to shield his body. The left handed

person would shield himself with the right hand
while using the left hand for fighting. The  

person who is shielded his body on left side
protected is heart because the heart lies on the

left side. So , such fighters had better chances
for survival. The left handed fighters would

be wounded around their heart and die. So,more  
right handed person lived on earth.