They believe this uniformity is because every living thing is made up of distribution networks carrying blood, air and other nutrients first through big tubes such as the aortic artery and then through a succession of smaller tubes to the capillaries, which finally distribute the nutrients to cells. Within each class of the last stage of the chain, species, such as mammals, the size of the capillaries, is the same. So are the cells that we are all made of. But as the organism gets bigger, the distribution network increases more than would be expected -- as if it had a fourth dimension. It is this increase in dimensionality that accounts for the 4. The 4 represents actually 3 + 1, where 3 is the dimensionality of the space we live in. Auckland University physicist Dr. Peter Wills says the theory developed by Dr. West and his colleagues is widely accepted, even though it is still being developed. "There is a great deal of interest in the approach he has taken," Do. Wills said. "I don't know anybody who thinks it's nonsense."

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