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1st to observe a “microscopic mushroom” (mold) with a simple “microscope”
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Made better lenses, observed bacteria, protozoa, algae, etc. Wrote the Royal Society of London
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Introduces vaccination for smallpox
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Proposed that microscopic organisms are causative agents in several diseases.
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Refutes spontaneous generation.
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Microbes cause wound infections; antiseptic surgery
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Developed pure culture and other lab techniques
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Describes the Gram Stain
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Discover structure of DNA.
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Classifies all organisms into three domains
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