Robert Koch — "The existence of microorganisms as a cause of disease is no longer a matter of t…"
The existence of microorganisms as a cause of disease is no longer a matter of theory, but a demonstrated fact.
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More from Robert Koch
"I have always believed that careful observation is the key to scientific discovery."
"The progress of medicine depends on rigorous scientific inquiry."
"The study of bacteria has opened up a new world of knowledge, and it is a world full of wonders."
"The results of my investigations have been confirmed by many other workers."
"My work in Africa on sleeping sickness was particularly challenging."
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