Why are some people left handed?0:02
About 4% of people are left handed.0:07
From history we know that some of the most talented men and women have been left handed.0:10
Leonardo da Vinci and Michelangelo, the greatest sculptors of all time, were both left handed at the same time.0:17
We live in in a right handed world.0:25
We make our scissors, cars, musical instruments and other things mostly for right handed people.0:28
So left handed people have to learn to use them.0:35
We don't know what makes most people right handed.0:38
The body is not symmetrical, not quite the same on both sides.0:44
For example, the right side of the face is a little different from the left.0:49
One of our legs is not as strong as the other.0:54
Our feet, toes or shoulders may be a little different in size.0:57
And this asymmetry goes through our whole body.1:02
The same is true about the brain.1:05
The human brain has two halves which don't work the same way.1:07
People believe that the left half of the brain is more active than the right half.1:12
The nerves from the brain go to the opposite side of the body.1:17
That's why the right half of the body is better able to do things.1:21
We read, write, speak and work with the left half of the brain.1:26
And this makes most of us right handed too.1:31
But with some people, the right half of the brain is more active.1:34
And these people work best with the left side of their bodies.1:38
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