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We would have thought for much longer that the earth was the center of the universe if Nicolás Copérnico hadn't discovered the Copernican theory.
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If telescope Galileo's hadn't existed, we wouldn't have known the Milky Way and tested the theory of Copernicus
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A vaccine wouldn't have been able to save mankind from an illness if it hadn't developed antibodies to the defense.
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If Crawford W. Long hadn't experienced the effects of a liquid called ether, he wouldn't have discovered the anesthesi
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The surgery couldn't have had so successfull, if the anesthesia hadn't locked the pain in the patients
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If natural selection hadn't existed, the evolution on earth wouldn't have achieved,
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If Darwin hadn't given his great contribution to the theory of evolution by natural selection, we wouldn't have solved the question of how life originated species.
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if canadians F.G Banting y C.H best hadn't been able to isolate insulin from animal pancreas, the diabetes wouldn't have had an effective solution.
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People with diabetes would haven't achieved a better quality of life if Eli Lilly hadn't launched the first commercial insulin with the name "Iletin"
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If in 2006 hadn't launched the vaccine for human papillomavirus , the women 21 century would have died of cancer of the cervix.