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history is important: every day, we are reminded of the power of the past to shape our lives and the society we live in, be it a family, nation, culture, religion, or some other historically constituted community. the way we understand history shapes our present and how we view the world and affects how we understand reality and our own futures. a proper understanding of how history shapes the present and the future is paramount to engaging and understanding the world around us. there are a lot of events in history that changed the face of the world. some of the events cover just a few years, while others cover centuries. some impacted only a single country or continent, while others spread out and touched every continent on earth. some are violent conflicts like wars or revolutions, while others were scientific revolutions of the mind that brought human beings around to whole new ways of thinking and living. but no matter their differences, each of these events left behind a brave new world in their wake. for the sake of historical and scientific objectivity and accuracy, this list will exclude mythological events such as the trojan war. this list will also exclude religious matters such as the life of muhammad or jesus of nazareth.

one of the events that changed the world is medical revolution. the work of louis pasteur led to a wide acceptance of the germ theory of disease, which allowed for cures for many infectious diseases to be developed in the 19th century. the invention of vaccines eliminated horrific diseases like smallpox from the face of the earth and immunized children against polio and rabies. public health measures were passed as the growing populations of cities made systematic sanitation necessary. alexander fleming invented penicillin as the first real antibiotic in 1928, which proved to be effective against many deadly bacterial infections. these developments, along with advances in technology, chemistry, and biology, led to the age of modern medicine.