When an engineer finds something wrong with a pump or a filter, he can order a new one. Doctors dealing with the human blood system cannot. This week researchers at the University of California announced that they have found a new way of getting around the difficulty: they have linked two people together, through their arteries, so that both have a common circulation like Siamese twins.
In earlier attempts to do this, doctors relied on mechanical pumps to boost the blood on its way. At California's medical school, blood pulsing down each man's main thigh artery is shunted into the corresponding artery...
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