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The discovery of blood cells in the human body paved the way for advanced studies in cell biology. Early discovery of genes in volved in human development by Edward Lewis, Christine Nusslein and Eric Wieschaus in 1995 is a clear demonstration of the importance of microscopes in the life sciences.
At this time, Dutch spectacle makers were experimenting with multiple lenses. Telescopes were invented in this way. By reversing a telescope the microscope was discovered! Credit for the first microscope is usually given to Zacharias Jansen in Middleburg, Holland around 1595. The Jansen microscope was composed of 3 sliding tubes, measuring 18 inches long when fully extended and 2 inches in diameter.