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If in 1543 Nicolaus Copernicus on his deathbed hadn´t suggested that Earth revolved around the sun, still would thought that the universe revolved around the Earth.
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If Sir Isaac Newton hadn´t developed the laws of motion, which explain the movement of all physical objects, perhaps the human has not walked in the moon yet.
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If Antonie van Leeuwenhoek hadn´t constructed his own microscope and discovered microorganisms, he wouldn´t have be known as the first microbiologist.
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If August kekule hadn´t written a model, mankind would passed a long time without visualized the chemical structure of atoms.
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If Dmitri Ivanovich Mendeleiev hadn´t discovered the periodic table, scientists haven´t an easier way to teach elements to students.
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If Louis Pasteur hadn´t discovered how to “pasteurize”, people wouldn´t have been able to keep things germ free.
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If Louis Pasteur hadn´t discovered the germ theory, the beginning modern medicine would delayed a long time.
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If the scientists haven´t discovered the importance of vitamins in our diet, we wouldn´t have been able to prevented many diseases without much effort as scurvy.
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If Karl Landsteiner had not discovered that not all-human blood is the same, the physicians wouldn´t have been able to made blood transfusion.
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If the scientists haven´t invented the insulin, diabetes may be take more lives that time ago.