The Dirty Secret behind Some of the World's Earliest Microscopes
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Description
Dutch scientist Antonie van Leeuwenhoek made extraordinary observations of blood cells, sperm cellsĀ and bacteria with his microscopes. But it turns out the lens technology he used was quite ordinary.
Cows and at least one person in the U.S. have been sickened by avian influenza. We asked experts about the risk to humans.
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