Scientific facts to answer for some of ur Y's: Y are some people left-handed? Is this type of preference restricted to humans alone?

       Nearly 75% of the population is strongly right-handed and about 90% is predominantly right-handed. Among the rest, a great deal of variability exists. Some are strongly left-handed, and others, called ambidextrous, are left-handed for some activities and right-handed for others.

      Researchers suggest that differences in left and right-handers in patterns of brain organisation may be associated with differences in skills, aptitude and perhaps even personalities. In the large majority of right-handers, speech is controlled by the left side of the brain. 

      Handedness is defined as a preference for the use of either the right or left hand. Although most animals have a preferred paw/hand; only people have a species-typical preference for the right hand.
      Only after 6 months of a baby's birth, they start showing a preference for either the right or left side of their body. This is due to functional asymmetry of two sides of the brain. It is said that the left hemisphere of the brain controls the right side of the rest of the body and vice versa.

     






      In left-handers, the brain organisation is unpredictable. In about 71% of the left-handers speech is controlled by the left hemisphere of the brain, as is the case for right-handers; but in the remaining left-handers speech is controlled by the right hemisphere. In some left-hander cases, both hemispheres are capable of controlling speech.
      Some findings say that genes may also play a role in this handedness. But the precise mechanisms by which genes affect handedness is still unknown. A physical injury may also be involved.
      Social pressure have had a considerable effect on handedness. Using the left hand to pass on or receive something is strongly discouraged even now in many countries including India. Only in recent years has society become tolerant of differences among people to accept left-handedness as a benign trait.
      Left-handedness is generally associated with special talents and also certain disorders such as stuttering, dyslexia, depression and emotional withdrawal.

Many famous people including Leonardo Da Vinci, Benjamin Franklin, Lewis Carroll were left handed. Recent one in spotlight is the present president of USA, Barack Obama :)
P.S: Einstein is right handed. ^_^ shown here for the sake of example for a right-handed person

 This post dedicated to all left-handers out there. N also to celebrate the Left-Handers day which happens to be on August 13th ♥♥


  Thats all folks, A Scientific fact thus explained.

   More to be continued................. :)