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Oakley attributes the reason for right-handedness to the use of tools and weapons by the right hand. This is rather a naive explanation because surely, before picking up a tool, there must have been a reason for choosing the right hand to do so in preference to the left.
It is more feasible that right-handedness started early in the savannah, when humans walked tripedally, using their right hand to carry extra food. The right side of the body is fractionally heavier than the left, from embryo on, and this unconsciously gave humans more confidence; they felt it was more solid: they felt their right hand was stronger. The right side of the body inspired confidence too, because the temperature on the right of the body is slightly higher than on the left, and in most dual organs such as breasts, thyroids, ovaries, lungs, and testicles, the right ones are more developed than the left.
Above all, given the position of the heart, the left blood vessel which supplies the left hemisphere of the brain where the co-ordinating centers for the right side of the body lie, is shorter, therefore supplying the blood quicker, providing better co-ordination on the right side of the body.
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