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Zacharias Janssen Netherlands Spectacle maker Invented first microscope 1590 Anton van Leeuwenhoek Netherlands Observed bacteria (1674) and Red blood cells (1675) Van Leeuwenhoek’s microscope Evangelista Torricelli Italy 1st Mercury barometer (1643) Measures air pressure, helped predict the weather Gabriel Fahrenheit Poland 1st Mercury Thermometer (1714) Temperature scale: 32° = Freezing 212° = Boiling Anders Celsius Sweden Astronomer, created temperature scale where 0° = freezing, 100° = boiling (1742) Andreas Vesalius Flanders Physician, published findings on human anatomy (1543) Studied Cadavers Edward Jenner Britain Introduced vaccine to prevent smallpox (1796) Robert Boyle Britain “Father of Modern Chemistry” Challenged Aristotle, explained relationship between volume, temperature pressure (1661)
