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Period: 4000 BCE to 3000 BCE
primitive times
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Period: 800 BCE to 1400 BCE
Middle Ages
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Period: 400 BCE to 800 BCE
Dark Ages
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1294
Roger Bacon
Roger Bacon promoted chemical remedies to treat disease
researched optics and refraction (bending of light rays) -
Period: 1350 to
Renaissance
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Period: 1501 to
16th and 17th centuries
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1550
Michael Servetus - Renaissance
Michael described the circulatory system in the lungs and explained how digestion is a source of heat for the body
alive 1511-1553 -
Period: to
18th, 19th, 20th, and 21st centuries
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Gabriel Fahrenheit
created the first mercury thermometer in 1714
