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It is believed that Zacharias Jansen's father, Hans, helped him build the first microscope in 1595. Zacharias wrote to a Dutch diplomat, William Boreel, about the invention. When the physician of the French king inquired about the invention in the 1650's, Boreel recounted the design of the microscope.
What did Zacharias Janssen invent? Both Janssens are often credited with inventing the microscope, but many suspect that the real credit goes to the father, because the microscope was invented in 1590, when Zacharias was still a youngster.