In 1912 Anatomist Eleanor Linton Clark of the University of Pennsylvania accidentally ran a glass tube, fine as a hair, into her finger. A few days later, when her finger swelled, her husband & colleague, Anatomist Eliot Round Clark, probed out the sliver of glass. To their amazement, the Clarks saw tiny blood vessels sprouting inside the tube. Because they were scientists, that gave them an idea. They got three rabbits, slit the delicate skin of their ears over a dime-sized area, sandwiched the ears between oval glass windows, long as an egg. Then, because they were scientists, they proceeded to...
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